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”。
（）中毒可引起紫绀。
A、苯胺
B、一氧化碳
C、氰化氢
D、氯气
When I was an editor, I always preferred to apologise promptly, what the merits of the case, rather than face the expense and, importantly, the time consuming complexities and debilitating worry of litigation, libel being one of the least satisfactory branches of the law.
A. whichever, more importantly B. whatever, more importantC. whichever, more important D. whatever, more importantly
