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当前学科：钻井司钻工考试
题目：
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在组合钻具时井口操作正确的是（）。
A . 放卡瓦时钻具下放速度要快
B . 放卡瓦动作要快.利索
C . 当卡瓦牙板有脏物时，要及时清理
D . 选择合适的钻具卡瓦
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