当瓦斯在空气中的浓度为()时,最容易爆炸,在()时,爆炸压力最大。
参考答案:8.2%-8.5%;9.5%
When people from western countries want to relax themselves, they prefer _____with their families rather than .
A. to watch TV, staying at home
B. to watch TV, go out
C. to drive out, watch TV at home
对拥有复杂产品的企业来说,一般决定产品结构的基本因素是( )。
A.市场引力
B.市场容量
C.产品线
D.企业实力
E.企业领导意图