下列使用安全帽（crash helmet）的做法，那种不正确（）

A.safety helmet

B.safety vest

C.protecting mask

D.earplugs

A.safety helmet

B.safety vest

C.protecting mask

D.earplugs

A.helmet

B.sled

C.ship

A.n.头盔；钢盔

B.n.误解；误会

C.n.决心；果断

A.ycle helmet

B.turn off

C.put on

A.室内作业

B.露天作业

C.隧道

A.室内作业

B.露天作业()

C.隧道

The case of Schutt helmet demonstrated that ______.

A．some injury claims were no longer supported by law

B．helmets were net designed to prevent injuries

C．product labels would eventually be discarded

D．some sports games might lose popularity with athletes

A.室内作业

B.露天作业

C.隧道

D.阀井

A.现场人员必须佩戴安全帽，并系好下颚帽带

B.可随意改变安全帽的任何结构

C.可将安全帽充当器皿使用

D.可将安全帽当坐垫使用