题目内容
当锯削较软的金属材料时，应采用细齿钢锯条。
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He ______ his coat when he walked into the office.
Many of you are studing English and you may be (41) why it is so difficult to learn. It’s actually not too difficult to learn (42) you know some (43) about the language and culture that it reflects (反映)。 Perhaps the first thing you need to know about English is that it is made up of several other languages (44) French, German, Latin, Greek and Angle Saxon. In addition (此外), there are words (45) Spanish and many American Indian words and names, even some Chinese and Japanese (46) can be found in the English language. This borrowing of words (47) other languages is (48) of the key reasons (49) some of the difficulties that people meet with (50) they are learning English.
任何物体在空间不受任何限制时，有6个自由度。
Who is the boy talking with
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