加工工艺过程
关于钻具防提断装置正确的是（）。 ["与半封闸板防喷器关闭腔连接","与全封闸板防喷器关闭腔连接","与半封闸板防喷器开启腔连接","与全封闸板防喷器开启腔连接","防误操作提断钻具的一种安全装置"]
钾的促进光能的利用，增强光合作用
立地条件类型组
旋转控制头主要由（）、灌浆管汇等组成。 ["壳体","旋转总成","冷却润滑动力泵站","监控台","管线"]
As we are heavily committed,we are sorry that we are not in a（）to accept new orders.
