下面不属于物理层特性的是( )。
A．机械特性B．标准特性C．电气特性D．功能特性E．规程特性
参考答案：B
As to the unemployment, the government has taken a series of measures in many areas, _______ I am sure, will benefit the people out of work.
A．which
B．that
C．what
D．where
搞好商业服务，要在哪几个方面下功？：
