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问题
填空题
钎焊用的钎料的熔点要比母材熔点()。
答案
参考答案:
低
选择题
Chengdu Metro Line l, _____ into use in October 2010, has made the traffic in this city not so busy.
A. to be put
B. being put
C. having put
D. put
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单项选择题
传动箱内油位和油温是否正常,传动箱油温应小于()。
A、55℃
B、65℃
C、75℃
D、85℃
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