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【简答题】Grignard试剂(卤代烃基镁)广泛运用于有机合成中，Grignard试剂的合成方法是：RX＋Mg RMgX(Grignard试剂)。生成的卤代烃基镁与具有羰基结构的化合物(醛、酮等)发生反应，再水解就能合成各种指定结构的醇： 现以2－丁烯和必要的无机物为原料合成3,4－二甲基－3－己醇，进而合成一种分子式为C 10 H 16 O 4 的具有六元环的物质J，该物质具有对称性。合成线路如下： 请按...
【简答题】凯恩斯认为人们持有货币的动机有()、预防动机和投机动机。
【简答题】凯恩斯认为人们持有货币的动机有_( ) _、( ) 和_( ) 。
【单选题】The husband and wife in the story ______.
A.
wished to buy a TV
B.
went to the sales the year before
C.
often went to the sales to buy clothes
D.
were usually not short of money after Christmas
【简答题】The husband wished to invite ________________, but the woman did not agree and wished to have _____________ , while their daughter suggested: “____________________________________?
【单选题】It was obvious that she and her husband were ______ and she wished she'd never married him.
A.
insolvable
B.
insensible
C.
inseparable
D.
incompatible
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