Partnering协议是在( ),由建设工程参与各方经过讨论协商后签署。
A.工程合同签订后 B.工程合同签订前C.工程招标阶段 D.工程验收合格后
参考答案:A
The () in e-mail messages has affected almost every computer around the world and has caused the damage of up to US$1 billion in North America.
A.illness
B.virus
C.weakness
D.attachment
钻井绞车轴每米长度内有()的弯曲度就不能再继续使用。
A.0.1mm
B.0.2mm
C.0.3mm
D.0.4mm