If you let challenges and difficulties benefit ______ depress you, much more can be accomplished than you thought possible.

A．more than

B．rather than

C．less than

D．other than

选择储罐区泡沫灭火系统时，（）应当选用液上喷射或半液下喷射泡沫系统。

 ；

A.水溶性甲、乙、丙液体的固定顶储罐

B.水溶性液体的立式储罐

C.烃类液体外浮顶储罐、内浮顶储罐、直径大于18m的固定顶储罐

D.外浮顶和内浮顶储罐