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【单选题】
在采用浮子式锅炉水位控制系统中,水位绕中间水位只做很小范围内的波动,其可能的原因 1浮球太重;2永久磁铁去磁现象严重;3调节板转动的枢轴卡阻;4调节板的上、下锁远离浮子杆;5调节板的上面锁钉离浮子杆太近;6调节板的下面锁钉离浮子杆太近。
A.
①②
B.
③④
C.
⑤⑥
D.
③⑥
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