设备安装工程利润的计费基础是( )。
A．直接工程费 B．直接费C．人工费D．人工费+机械费
参考答案：D
放大镜能将角放大．______（判断对错）
Can you solve such problems ___raised by the audience?
A．what were
B．as were
C．that were
D．which were
