解决问题的思维活动分几个阶段试分析影响问题解决的因素有哪些？

______to the sun for too long, I think, can hurt your skin.

A．Being exposed

B．To expose

C．Exposing

D．Exposed

一个SDH微波通信系统可由()组成。

A.端站

B.枢纽站

C.分路站

D.中继站

E.基站

It is a market which sales value might be more than 10 billion yuan.()

A. a market with a sales value that might be

B. a market which might be sales value

C. a market with sale value might be

D. market with sales might be a value

在气化炉内加入蒸汽可以加快烃类和碳黑的转化反应速度。

易燃易爆物品贮存应注意哪些事项？