八甲磷35mg/kg灌胃可引起成年大鼠100%死亡,而初生大鼠无死亡
A. 实验动物的物种与毒效应
B.实验动物的品系与毒效应
C.实验动物的性别与毒效应
D.实验动物的年龄与毒效应
E.实验动物的生理营养状况与毒效应
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Directions:Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1. Advances in computers and data networks inspire visions of a future "information economy" in which everyone will have (1) to gigabytes of all kinds of information anywhere and anytime, (2) information has always been a (3) difficult commodity to deal with, and, in some ways, computers and high-speed networks make the problems of buying, (4) , and distributing information goods worse (5) better. The evolution of the Internet itself (6) serious problems. (7) the Intemet has been privatized, several companies are (8) to provide the backbones that will carry traffic (9) local networks, but (10) business models for intereonnectinn—who pays how much for each packet (11) , for example—have (12) to be developed. (13) intereonnection standards are developed that make (14) cheap and easy to transmit information across independent networks, competition will (15) . If technical or economic (16) make interconnection difficult, (17) transmitting data across multiple networks is expensive or too slow, the (18) suppliers can offer a signfficant performance (19) ; they may be able to use this edge to drive out competitors and (20) the market.
A. transmitted
B. transferred
C. transformed
D. transported
多根多处肋骨骨折最主要的处理方法是
A. 应用抗生素控制呼吸道感染
B. 止痛、利于深呼吸
C. 鼓励病人咳嗽排痰
D. 吸氧、改善呼吸
E. 纠正胸壁反常呼吸运动
A.营养不足B.红细胞生成相对不足C.消耗增加D.骨髓造血容量减少E.血浆容量增高,血液被稀释下列红细胞增多是上述哪一种病因 红细胞非代偿性增多()
A. 营养不足
B. 红细胞生成相对不足
C. 消耗增加
D. 骨髓造血容量减少
E. 血浆容量增高,血液被稀释