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【单选题】
芳基重氮盐在一定条件下,能够发生失去氮被卤原子或氰基所取代的反应。在不添加亚铜化合物或铜粉的情况下,芳基重氮盐能够发生哪种基团的取代反应A.
氯化
B.
溴化
C.
碘化
D.
氰基化
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【简答题】A．The first wave is often the largest. B．The wave following large volume of water is usually not very long but very tall. C．The wave of tsunamis can spread across the sea in all directions. D．The wave...
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【单选题】Man: Have you called John to come and fix the TV set? Woman: I tried reaching him again and again but it seemed his phone was out of order. Question: What does the woman mean?
A.
John wasn't at home when she called.
B.
John's telephone wasn't working.
C.
She didn't get John's phone number right.
D.
The number she called was no longer in service.
【单选题】The （ ） volume is the largest, accounting for 80% of the total stomach volume.
A.
reticulum
B.
rumen
C.
omasum
D.
abomasum
【简答题】The volume of leukocytes as follows, monocyte is the largest.
【简答题】完成1-5段朗读录音
【单选题】下列原子的各种电子排布式,不属于原子激发态的是 ( )
A.
1s 2 2s 2 2p 4 3s 1
B.
1s 2 2s 2 2p 5 3s 2
C.
1s 2 2s 2 2p 6 3s 1
D.
1s 2 2s 2 2p 6 3s 1 3p 1
【单选题】For a diesel engine, when the piston is at the _____, the cylinder volume is the largest.
A.
TDC
B.
DTC
C.
BDC
D.
DBC
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