跟管钻进工艺主要用于()
A、漏失地层
B、松散破碎地层
C、易斜地层
参考答案:B
______ number of people who use English as ______ second language is increasing in China.
A.A; a
B.A; the
C.The; a
D.The; the
掘进工作面预测参数超标后应视为有(),(),并()。