丙烯腈、苯乙烯(丁二烯)共聚树脂的主要卫生问题是()
A.树脂的本身毒性
B.丙烯腈单体残留
C.苯乙烯单体残留
D.丁二烯单体残留
E.聚合中添加的防老剂
参考答案:B
I'm my brother. [ ]
A. similar with
B. similar for
C. similar to
Who has responsi bilities to maintain the ship?()
Flag State
shipowner
crewoftheship
managecompanyoftheship