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问题 选择题

下列物理量属于标量的是[ ]

A. 加速度  

B. 力

C. 电场强度  

D. 功

答案

答案：D

选择题
What worried the child most was ______ to visit his brother in hospital.

A. his not being allowed
B. his not allowing
C. his being not allowed
D. having not been allowed
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多选题

用铂（惰性）电极进行电解，下列说法中正确的是（　　）

A．电解稀硫酸，在阴极和阳极分别产生氢气和氧气

B．电解氯化钠溶液，在阴极析出钠

C．电解硫酸钠溶液，在阴极和阳极析出产物的物质的量之比为1：2

D．电解氯化铜溶液，在阴极和阳极析出产物的物质的量之比为1：1
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