方钻杆旋塞阀在联接到钻柱上之前,须处于“全关”状态。()
参考答案:错
解析:
标准答案:方钻杆旋塞阀在联接到钻柱上之前,须处于“全开”状态。
方钻杆旋塞阀在联接到钻柱上之前,须处于“全关”状态。()
参考答案:错
解析:
标准答案:方钻杆旋塞阀在联接到钻柱上之前,须处于“全开”状态。
完形填空。 | ||||
Mr. Roy likes to travel 1 in his spare time. He likes to sit beside the window and look the scenery | ||||
|