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【判断题】
亲核重排、自由基重排和协同重排。A.
正确
B.
错误
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举一反三
【单选题】Why does the man regret taking his vacation?
A.
He was not able to do what he had intended.
B.
He didn't like the place he had seen.
C.
He ended up spending too much money.
D.
He couldn't meet the person he wanted.
【单选题】Directly he arrived the bus station, then ____ he had intended to take.
A.
a bus did come
B.
a bus came
C.
came a bus
D.
did a bus come
【简答题】多组分系统热力学作业上传区
【单选题】空白信号(当样品中无待测组分时,仪器所产生的信号)与本底信号(没有样品时,仪器所产生的信号)的不同之处,主要是由于( )
A.
仪器周围磁场的干扰所致
B.
样品中除待测组分外的其他组分的干扰所引起的
C.
仪器随机噪声的存在
D.
溶剂的干扰所引起的
【简答题】Mr Brown had intended to catch the early train, but he didn’t get up __________ time.
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