两性离子聚合物钻井液的渗透率恢复值()分散型钻井液。
A、低于
B、等于
C、高于
D、低于等于
参考答案:C
—Are there any bridges near here? —Yes, there . [ ]
A. have
B. is
C. are
打入桩开始前桩体吊装就位后,应用经纬仪等在()。