主冷（）越小，相应的（）越低。
参考答案：温差；下塔压力
It is a tradition for the Chinese to ______ about the bush, which sometimes makes foreigners
puzzle or misunderstand what you are saying. [ ]
A. go
B. eat
C. beat
D. wander
已知a+b=-3，a2b+ab2=-30，则a2-ab+b2+11=______．
ying. [ ]