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单选题 Which coal is brown in colour
学科：煤化学
时间：2024-02-25 04:27:57
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题目1单选题
Which component determines the state of smoke when coal is burningA. ash contentB. volatileC. sulfurD. moisture
题目2单选题
Which coal is brown in colourA. ligniteB. bituminousC. sub-bituminousD. anthracite
题目3单选题
The first stage in the formation of coal is calledA. coalificationB. peatificationC. sedimentationD. I don't know
题目4单选题
Which coal has the strongest lusterA. ligniteB. bituminousC. sub-bituminousD. anthracite
题目5单选题
Which factor determines the form of coalA. temperatureB. timeC. pressureD. I don't know
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