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【单选题】
以下发动机二级维护作业内容是()A.
拆检清洗机油盘、集滤器；检查曲轴轴承松紧度，校紧曲轴轴承螺栓、螺母
B.
更换气门油封
C.
更换曲轴前后油封
D.
检查和更换节
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反馈参考答案：
举一反三
【单选题】There is ________ work to do and the work is ________ difficult. [ ]
A.
too much, much too
B.
too much, too much
C.
much too, too much
D.
much too, much too
【单选题】Eta Carinae is hard to observe because
A.
it is too far away.
B.
there is too much dust and gas around it.
C.
the binoculars are not powerful enough.
D.
it does not send out infrared light.
【单选题】Li Lei can't go to visit the Palace Museum because he has _______ things to do. [ ]
A.
too many
B.
much too
C.
too much
D.
many too
【单选题】He eats ________ food, so he is ________ fat.
A.
much too, too much
B.
much too, too many
C.
too much, much too
D.
too much, many too
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