外螺纹半锁接箍
参考答案：
一端为内螺纹与钻杆连接，另一端与内螺纹半锁接箍连接，带一个切口的接箍。被代替的同义词：“公接箍”。
Can you tell _______ ? [ ]
A. when did it happen
B. when was it happened
C. when it happened
D. when it was happened
“双拥”是（）的简称。
A、拥军拥政
B、拥军优属；拥政爱民
C、拥军优抚；拥政爱民
D、拥军爱民；拥政优属
