下螺杆钻具前,应检查螺杆钻旁通阀活塞是否灵活。
参考答案:对
周围血管征不包括
A.毛细血管搏动
B.明显颈动脉搏动
C.奇脉
D.水冲脉
E.点头运动
Don't refer to the dictionary every time you come across a new word as sometimes its meaning may be _____
clearly in a given context. [ ]
A. picked out
B. ruled out
C. brought out
D. taken out