装有SF6设备的配电装置室和SF6气体实验室,必须装设_____。
参考答案:强力通风
划定基本农田保护区的根本目的是为了对基本农田实行一定的保护。 ( )
The effect a teacher has _______ children may be greater than that of their parents.
A.in
B.on
C.at
D.with