平衡堵漏法是将（）经钻杆泵送至井内，并顶替至钻杆内外的水泥面相等为止。
A、清水
B、盐水
C、堵漏水泥浆
D、钻井液
参考答案：C
Why not get some work experience first _____ straight on to university?[ ]
A. rather than go
B. rather than went
C. instead go
D. instead of go
碳化成型工艺
