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【判断题】
平行轴式起动机的齿轮需要拨叉使之伸出或退回。 ( )A.
正确
B.
错误
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【单选题】From the passage we know that ammonium nitrate is a kind of ______.
A.
natural gas, which can easily catch fire
B.
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C.
poisonous substance, which can't be used in overcrowded areas
D.
fuel, which is stored in large tanks
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