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【单选题】
对于烯烃来说下列反应中()是加成反应。A.
R-CI=CH2+Mn04-→RC0OH+CO2+MnO
B.
R-CH=CH2+MnO4-RCOOH+CO2+Mn02.
C.
CH3-CH=CH2+Br2→CH2BrCH=CH2+HBr
D.
CH2-=CH2+F2→CH2FCH2F
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【单选题】Historians tend to tell the same joke when they are describing history education in America. It's the one【C1】______the teacher standing in the schoolroom door【C2】______goodbye to students for the summ...
A.
in
B.
by
C.
for
D.
about
【简答题】v. 抢占,抢先;抓住,攫取 g_____
【简答题】v.抓住,攫取
【单选题】Historians tend to tell the same joke when they are describing history education in America. It's the one【56】the teacher standing in the schoolroom door【57】goodbye to students for the summer and calli...
A.
about
B.
in
C.
for
D.
by
【单选题】Historians tend to tell the same joke when they are describing history education in America. It's the one【B1】the teacher standing in the schoolroom door【B2】goodbye to students for the summer and calli...
A.
about
B.
in
C.
for
D.
by
【单选题】When Americans tell a joke, they often ______.
A.
pat people on the head
B.
give people a hug
C.
dig people in the ribs
D.
touch people on the arm
【单选题】breach [bri:tF]
A.
n. 违背, 破坏, 破裂, 裂口 vt. 打破, 突破
B.
n. 敲打, 拍子, 巡逻区域 v. 打, 打败
C.
v. 绑, 镶边, 装订, 凝固, 约束
D.
v. 抓住, 攫住 n. 离合器
【简答题】g________ v. 抓住,攫取
【单选题】Historians tend to tell the same joke when they are describing history education in America. It's the one【C1】______the teacher standing in the schoolroom door【C2】______goodbye to students for the summ...
A.
about
B.
in
C.
for
D.
by
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