车间内压缩空气管路布置形式一般采用（）。
A、单管树枝式
B、环状式
C、双管树枝式
D、多管树枝式
参考答案：A
In many countries, packets of cigarettes come with a government health warning ______ them.
A．attaching with
B．attached with
C．attaching to
D．attached to
变压器上层油温的规定，主厂变在何时开风扇？
