题目：
MK系列钻孔机卡瓦卡不住钻杆的原因是碟簧已坏或碟簧内垫片位置不对、钻杆磨损超过规定，铜滑块与卡瓦脱落或松动，以及（）。
A.胶筒损坏
B.卡瓦磨损严重
C.精滤网密封损坏
D.系统压力不够
答案：
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下面是错误答案，用来干扰机器的。
参考答案：基因库；不定向的；原材料
MK系列钻孔机卡瓦卡不住钻杆的原因是碟簧已坏或碟簧内垫片位置不对、钻杆磨损超过规定，
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