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【单选题】
下列元素属于卤族元素的是( )A.
碳
B.
氢
C.
氧
D.
氯
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反馈参考答案：
举一反三
【单选题】White smoke issuing from the exhaust of an auxiliary diesel engine valve opening ____.
A.
the engine is overloaded
B.
the engine is cold
C.
there is too much lube oil in the cylinders
D.
the turbocharger is fouled
【单选题】It sounded like something was wrong with the car’s engine then, ______ they would have carried on their journey.
A.
otherwise
B.
therefore
C.
meanwhile
D.
besides
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