--- Look, Mr Green is on the other side of the street.

--- It _____ be him.He has gone to London on business.

A．must

B．might not

C．can’t

D．mustn’t

以下不属于减少事故损失的安全技术措施的是( )。

A．故障-安全设计
B．个体防护
C．设置薄弱环节
D．隔离