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问题
填空题
泵的扬程与其转数()成正比。
答案
参考答案:平方
选择题
The newly-published book ______ thirty maps, ______ five of Japan.
A. contains; including
B. is containing; including
C. includes; contained
D. includes; containing
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单项选择题
对心脏骤停患者实施胸外心脏按压的频率是()
A.60次/min
B.80次/min
C.90次/min
D.100次/min
E.120次/min
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