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【单选题】
等离子弧有哪几种类型?A.
1
B.
2
C.
3
D.
4
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参考解析：
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皮皮学刷刷变学霸
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【单选题】What will most likely be done if concrete sleepers are too expensive?
A.
the sleepers will be replaced with hardwood sleepers.
B.
the track will continue to be used with old sleepers in place.
C.
the track will be put out of use.
D.
the gauge of the track will be changed.
【单选题】What do we know from the conversation?
A.
Both the man and the woman were late．
B.
Neither the mail nor the woman was late．
C.
The mall was late while the woman was on time
【单选题】Jim was late for two classes this morningHe said that he forgot both of the .
A.
rooms number
B.
room number
C.
room' s number
D.
room numbers
【简答题】Long sleepers are reported to be more likely to ________.
【单选题】The two students _____ late yesterday. [ ]
A.
are all
B.
were all
C.
are both
D.
were both
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