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【单选题】
分离麻黄碱和伪麻黄碱是利用()A.
硫酸盐溶解度
B.
草酸盐溶解度
C.
硝酸盐溶解度
D.
酒石酸溶解度
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反馈参考答案：
举一反三
【单选题】What did the man do before attending a drama school?
A.
He joined a band.
B.
He joined an amateur theatre club.
C.
He worked for a club as a waiter.
【单选题】He ___________the club when he was studying in New York. [ ]
A.
joined
B.
joined in
C.
took part in
D.
attended (出席)
【简答题】悬架一般由()、()、()等三部分组成
【单选题】He ( )( )( )the Communist Party( )( )( )2009.
A.
has joined, in
B.
has joined, since
C.
joined, on
D.
joined, in
【单选题】He ( )( )( )the Communist Party( )( )( )2002.
A.
has joined in
B.
has joined since
C.
joined on
D.
joined in
【单选题】What can be inferred about Jack McCarrol?
A.
He joined AIE online.
B.
He recently joined AIE.
C.
He runs his own engineering firm.
D.
He wrote a letter of complaint to AIE.
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