职业性肿瘤的好发部位多见于
A.阴囊B.皮肤与呼吸系统C.皮肤与消化系统D.鼻窦E.膀胱
参考答案:B
—_____ swim in the river?
— oh, no. Our teacher told us ____ here. It’s dangerous.
A.Why don’t; not swim
B.Why not; not to swim
C.Why not; don’t swim
D.Why don’t; don’t swim
需要变更工作班成员时,须经工作负责人同意后方可进行工作。