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【单选题】
的《明妃曲》大致创作于( )年间。
A.
庆历
B.
嘉佑
C.
熙宁
D.
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【单选题】氨合成铁催化剂还原后的活性组分是()。
A.
四氧化三铁
B.
氧化铁
C.
氧化亚铁
D.
单质铁
【单选题】钢与铁的组分的区别在于 不同。
A.
铁原子
B.
含量碳
C.
结晶
D.
掺杂元素
【单选题】The boss of the company had _________ his friend’s good advice, which led to the failure of his business.
A.
considered
B.
suffered
C.
ignored
D.
discussed
【简答题】多组分精馏中,关键组分是指( )的组分。
【简答题】多组分精馏中,关键组分是指(    )的组分。
【单选题】碳素钢中的主要强化组分是(    )。
A.
铁素体    
B.
奥氏体    
C.
渗碳体
【单选题】Little ______  that we were watching his every move,so he seemed to be going his own way in this business.
A.
he knew
B.
he didn’t know
C.
didn’t he know
D.
did he know
【单选题】______ the advice of his friends, he would not have suffered such a heavy loss in his business.
A.
If he took
B.
If he should take
C.
Were he to take
D.
Had he taken
【单选题】Little _____ that we were watching his every move, so he seemed to be going his own way in this business. [     ]
A.
he realized
B.
he didn't realize
C.
didn't he realize
D.
did he realize
【单选题】钢与铁的组分的区别在于 不同。
A.
铁原子
B.
掺杂元素
C.
结晶
D.
碳含量
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