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【单选题】
保修作业中,不镗气缸,更换活塞环时,开口间隙应以()为基准锉修。
A.
上缸口未磨损部位
B.
气缸最大磨损部位
C.
活塞在下止点时环对应的部位
D.
任意位置
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A.
Working at the office is safer than staying at home.
B.
Travelling to work on public transport is safer than working at the office.
C.
Staying at home is safer than working in the chemical industry.
D.
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A.
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B.
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C.
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D.
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A.
正确
B.
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【多选题】内向型旅游者的个性特征( )。
A.
喜欢家庭气氛
B.
愿意接触外国居民
C.
喜欢日光浴
D.
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A.
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B.
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