根据国家现行职业卫生监管工作分工,由()负责监督管理职业病诊断与鉴定的工作。
A.安全生产监督管理部门
B.卫生行政部门
C.人力资源社会保障部门
参考答案:A
. It is no good ___________ to come now. He is busy.
A.if you ask him
B.to ask him
C.asking him
D.that you ask him
对于原料气在催化剂上的反应来说,空速越大越好。