按温度分类，食品储存库房包括（）
A.常温库
B.冷冻库
C.冷藏库
参考答案：A, B, C
----Did you _________ your friend when you were in Beijing?
---No. But I _________ my aunt’s during my stay there.
A．call on; called on
B．call at; called at
C．call on; called at
D．call at; called on
正常或检修方式时，（）kV电网一相接地通过故障点电流不得大于10A。
A.110
B.220
C.35
