煤矿特种作业人员具有丰富的现场工作经验,就可以不参加培训。
参考答案:错
His idea is ______ you’d better ____ a jar of jam at home.
A.that; keep
B.that; not to get
C.which; keep
D.which; not to get
曾引起公害病的环境因子主要是()。
A、氟化物
B、甲基汞
C、甲醛
D、砷化物
E、非电离辐射