出境快件在其运输工具离境( )前向离境口岸检验检疫机构办理报检手续。
A．2小时 B．4小时 C．8小时 D．12小时
参考答案：B
. Mother has been busy packing my belongings, making sure I have everything I need. It feels as if she ____ to college with me.
A．were going
B．had gone
C．would go
D．has gone
高压电气装置的接地装置，应符合（）。
A.R≤2000／I
B.R≤120／I
C.R≤250／I
D.不宜大于10Ω
