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问题
单项选择题
根据泊肃叶定律,流体阻力,当半径r减小一半时,流体阻力R将增加()
A.2倍
B.4倍
C.8倍
D.16倍
E.32倍
答案
参考答案:
D
选择题
If you ask the way, which one can't you use?
A. Can you tell me the way to the park?
B. How can I get to the park?
C. Which is the way to the park?
D. Tell me the way!
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判断题
当医院处方笺保存期满后,由药剂科登记并销毁。()
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