调速器调速弹簧断裂后，调速器调速失灵，极易造成柴油机（）。
A.机油压力迅速升高
B.转速急剧下降
C.转速忽高忽低
D.超速运转
参考答案：D
—These things are not useful to anyone, are they?
—______. We can throw them away.
A．Yes, they are
B．Yes, they aren’t
C．No, they aren’t
D．No, they are
十灰散主治病证的病机是
A．脾气不足，脾不统血
B．血热妄行，损伤血络
C．肝火犯肺，损伤血络
D．脾气不足，冲脉不固
