WT-50型钻机的钻井动力是由（）提供的。
A.三联齿轮泵
B.液压马达
C.泥浆泵
D.液压油箱
参考答案：A
.Nother matter how low you consider yourself ,there is always someone _________you wishing
They were that high.
A．getting rid of
B．getting along with
C．looking up to
D．looking down upon
迄今为止，W3C已经给出了两种样式单语言的推荐标准，一种是CSS，另一种是XSL
