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数据模型是严格定义的一组概念的集合。通常由数据结构、数据操作和 【17】 3部分组成。
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Broadly speaking, the Englishman is a quiet, shy, reserved person who is fully (21) only among people he knows well.In the presence of strangers or foreigners he often seams inhibited. (22) embarrassed. You have only to (23) a commuter train any morning or evening to see the truth of this. Serious looking businessmen and women sit reading their newspapers or dozing in a corner; no one speaks. In fact, to do so would seem most unusual. (24) , there is here an unwritten but clearly understood code of behavior which. (25) broken, makes the person immediately the object of (26) .It is a well-known fact that the English have a (27) for the discussion of their weather and that, given half a chance, they will talk about it (28) . Some people argue that it is because English weather (29) forecast and hence is a source of interest and. (30) to everyone. This may be so. (31) Englishmen cannot have much (32) in the weathermen, who, after promising fine, sunny weather for the following day, are of- ten proved wrong (33) a cloud over the Atlantic brings rainy weather to all districts! The man in the street seems to be as accurate — or as inaccurate — as the weathermen in his (34) . The overseas visitors may be excused for showing surprise at the number of references (35) weather that the English make to each other in the course of a single day. Very often conversational greetings are (36) by comments on the weather. "Nice day, isn’t it" "Beautiful!" may well be heard instead of "Good morning, how are you" (37) the foreigner may consider this exaggerated and comic, it is worthwhile pointing out that it could be used to his ad- vantage. (38) he wants to start a conversation with an Englishman but is (39) to know where to begin, he could do well to mention the state of the weather. It is a safe subject which will (40) an answer from even the most reserved of Englishmen. 21().
存在于人和脊椎动物血清及组织液中的一组具有酶样活性的球蛋白称为( )
Broadly speaking, the Englishman is a quiet, shy, reserved person who is fully (21) only among people he knows well.In the presence of strangers or foreigners he often seams inhibited. (22) embarrassed. You have only to (23) a commuter train any morning or evening to see the truth of this. Serious looking businessmen and women sit reading their newspapers or dozing in a corner; no one speaks. In fact, to do so would seem most unusual. (24) , there is here an unwritten but clearly understood code of behavior which. (25) broken, makes the person immediately the object of (26) .It is a well-known fact that the English have a (27) for the discussion of their weather and that, given half a chance, they will talk about it (28) . Some people argue that it is because English weather (29) forecast and hence is a source of interest and. (30) to everyone. This may be so. (31) Englishmen cannot have much (32) in the weathermen, who, after promising fine, sunny weather for the following day, are of- ten proved wrong (33) a cloud over the Atlantic brings rainy weather to all districts! The man in the street seems to be as accurate — or as inaccurate — as the weathermen in his (34) . The overseas visitors may be excused for showing surprise at the number of references (35) weather that the English make to each other in the course of a single day. Very often conversational greetings are (36) by comments on the weather. "Nice day, isn’t it" "Beautiful!" may well be heard instead of "Good morning, how are you" (37) the foreigner may consider this exaggerated and comic, it is worthwhile pointing out that it could be used to his ad- vantage. (38) he wants to start a conversation with an Englishman but is (39) to know where to begin, he could do well to mention the state of the weather. It is a safe subject which will (40) an answer from even the most reserved of Englishmen. 40().
Broadly speaking, the Englishman is a quiet, shy, reserved person who is fully (21) only among people he knows well.In the presence of strangers or foreigners he often seams inhibited. (22) embarrassed. You have only to (23) a commuter train any morning or evening to see the truth of this. Serious looking businessmen and women sit reading their newspapers or dozing in a corner; no one speaks. In fact, to do so would seem most unusual. (24) , there is here an unwritten but clearly understood code of behavior which. (25) broken, makes the person immediately the object of (26) .It is a well-known fact that the English have a (27) for the discussion of their weather and that, given half a chance, they will talk about it (28) . Some people argue that it is because English weather (29) forecast and hence is a source of interest and. (30) to everyone. This may be so. (31) Englishmen cannot have much (32) in the weathermen, who, after promising fine, sunny weather for the following day, are of- ten proved wrong (33) a cloud over the Atlantic brings rainy weather to all districts! The man in the street seems to be as accurate — or as inaccurate — as the weathermen in his (34) . The overseas visitors may be excused for showing surprise at the number of references (35) weather that the English make to each other in the course of a single day. Very often conversational greetings are (36) by comments on the weather. "Nice day, isn’t it" "Beautiful!" may well be heard instead of "Good morning, how are you" (37) the foreigner may consider this exaggerated and comic, it is worthwhile pointing out that it could be used to his ad- vantage. (38) he wants to start a conversation with an Englishman but is (39) to know where to begin, he could do well to mention the state of the weather. It is a safe subject which will (40) an answer from even the most reserved of Englishmen. 29().
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