风钻钻眼在钻进(),且钻头不至于脱离眼口时,方可全速钻井。
参考答案:50mm
—Can I buy Jane Rye here?
—Sorry, but we’ll call you as soon as it becomes .
A.present
B.available
C.convenient
D.inexpensive
继发性肺结核包括()
A.血行播散性肺结核
B.浸润型肺结核
C.结核性胸膜炎
D.其他肺外结核
E.原发性肺结核