The old farmer,________ the badly-injured and wounded soldier, came out of the burning house, ________for help.

A．supporting; calling

B．supported by; called

C．being supported by; called

D．being supporting; called

地下市政管线工程按管线敷设形式分为（）。

A.搭设

B.预埋

C.架空架设线

D.压力管道

E.地下埋设线路