安装电工、焊工、起重吊装工和电气调试人员等，按有关要求（ ） A.
持证上岗 B.
进行培训 C.
施工 D.
检查资料

A．Physical check-up results.
B．Results of bloods sugar.
C．Interview of your health history.
D．X-ray reports for your chest.

A.40μm
B.60μm
C.80μm
D.100μm