供热站是供热管网的重要附属设施。是供热网路与热用户的连接场所，当热水热力站站房长度大于l2m时应至少设()出口。

A．两个

B．一个

C．三个

D．四个

It is not like her to be so impolite; she      you when you greeted her.

A．might not have heard

B．should not have heard

C．mustn’t hear

D．shouldn’t hear