The editor's job is to keep the newspaper______ and _____ to the readers.

A．balanced; interested

B．balancing; interesting

C．balanced; interesting

D．balancing; interested

国家标准中规定的一般用途往复活塞式内燃机台架试验类别有( )。

A．定型试验

B．疲劳试验

C．验收试验

D．抽查试验

E．功率试验