卸油区、油罐区内一切电器设施均应为（）型。
A、防静电
B、防爆
C、防水
D、防潮
参考答案：B
The President was talking to all the department heads while a group of unexpected important clients had arrived for a talk with him.
A．when ... were arriving
B．as ... had arrived
C．when ... arriving
D．when ... arrived
禁止在水体（）装贮过油类或者有毒污染物的车辆和容器。
A.搬运
B.清洗
C.行驶
D.漂流
