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问题
单项选择题
动力黏度单位
A.cm-1
B.pa•S
C.mm2/s
D.μl
E.kPa
答案
参考答案:B
选择题
A 78-year-old retired engineer has built a capsule hotel for Beijing’s “ant tribe”. Among the 6 volunteers to try out the apartments on April 3____ Sun Changyun, a college student from Shenyang.
A.were
B.are
C.was
D.is
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判断题
安全阀回座压力通常是指安全阀即将起跳的压力。
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