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问题 单项选择题

磁波在自由空间的传播速度为（）。

A.1×108m∕s

B.3×108m∕s

C.2.5×108m∕s

D.3×106m∕s

答案

参考答案：B

选择题
I hear they've promoted Tom, but he didn't mention _____ when we talked on the phone.

A. to promote            
B. having been promoted
C. having promoted        
D. to be promoted
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单项选择题

6岁男孩尿少，水肿2天，血压130/90mmHg，尿常规：蛋白(抖)，红细胞25个/HP，白细胞15个/HP。

该患儿首先考虑的诊断是

A．急性尿路感染

B．急性肾炎

C．单纯性肾病

D．急性肾小球肾炎

E．肾炎性肾病
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