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【单选题】
乙醇与下列哪个试剂反应生成乙酸乙酯,速度最快?A.
乙酰氯
B.
乙酸酐
C.
乙酸
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举一反三
【单选题】There are very few rules of grammar______.
A.
that are not with exceptions
B.
not having exception to them
C.
that do not have exceptions
D.
not with exception to them
【单选题】—The old store enjoys a good reputation in this area. —Can’t agree more. There are very few. _____, complains about their service.
A.
if any
B.
if ever
C.
if so
D.
if anything
【简答题】CA 的四大职能是 ___________ 、证书更新、 ______________ 和证书验证。
【单选题】In perfect competition,______.
A.
there are very few firms in the market
B.
there is a homogeneous product
C.
there are large barriers to entry
D.
there is imperfect information between consumers and producer
【简答题】我们把物联网分为四层:( )、( )、( )和( )。
【简答题】根据信息生成、传输、处理和应用的原则,我们把物联网分为四层:______、_____、_____和_____。
【单选题】There are very few rides of grammar______.
A.
that are not with exceptions
B.
but have exceptions
C.
not having exception to them
D.
not with exception to them
【简答题】CA 的四大职能是 ___________ 、证书更新、 ______________ 和证书验证。
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