皮皮学，免费搜题
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搜题
【单选题】
开式蜗杆传动的主要失效形式是A.
轮齿折断和齿面胶合
B.
齿面磨损和轮齿折断
C.
齿面点蚀和齿面磨损
D.
齿面胶合和齿面点蚀
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】They expected that several hundred guests would attend the opening ceremony, but only ______ people actually showed up.
A.
a great number of
B.
large amounts of
C.
a dozen of
D.
a crowd of
【单选题】Several guests were waiting in the ________for the front door to open.
A.
porch
B.
vent
C.
inlet
D.
entry
【单选题】Several guests were wailing on the ______ for the front door to open.
A.
porch
B.
vent
C.
inlet
D.
entry
【单选题】The hotel itself can hold 80 guests and, _________, there are several self-cooking apartments.
A.
in particular
B.
in fact
C.
in place
D.
in addition
【单选题】Several guests were waiting in the ________ for the front door to open.
A.
porch
B.
vent
C.
inlet
D.
entry
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