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