聚氯乙烯树脂不经汽提处理,仍然可以得到无毒PVC树脂。()
查看答案
Capital movement in the last few decades has been volatile and up to crisis. ()
仓库仓位的布置方法主要有()、纵列式与混合式三种。
A. 横列式
B. 前后式
C. 上下式
D. 左右式
Both the number and the amount of money involved in these cases have been increasing. ()