They stood there with their eyes____ , w_爱下问搜题

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问题选择题

They stood there with their eyes____ , watching over what was happening.[ ]

A. wide open

B. wide opened

C. widely open

D. widely opened

答案

答案：A

填空题

在某电场中的P点，放一个q₁=10^-9 C的点电荷，测得该点电荷所受电场力大小为10^-6N．若移走q₁，而在P点放置另一个q₂=10^-8 C的点电荷，则P点的电场场强大小为______N/C，q₂在P点所受电场力的大小为______ N．

单项选择题

气管切开术后病人每日呼吸时失水约为（）。

A.500ml

B.800ml

C.1000ml

D.1200ml

E.1500ml