消防水泵房安装一台控制配电箱，控制箱底口距操作平台高度为0.8m，操作平台距地高度为（）m。
A、1.5
B、8
C、5
参考答案：C
Would you please explain＿＿＿you do to make .your students so interested in your lessons?
A．what is it that
B．that what is it
C．that what it is
D．what it is that
产生串联谐振的条件是（）.
A.XL>XC
B.XLC.XL=XC
