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