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【简答题】
洗衣粉的主要成分之一是烷基苯磺酸钠，常用的是十二烷基苯磺酸钠，其合成路线如下：请回答下列问题：(1) 分子中 洗衣粉的主要成分之一是烷基苯磺酸钠，常用的是十二烷基苯磺酸钠，其合成路线如下：
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【单选题】The telephone __________ for almost a minute．Why doesn’t somebody answer it?
A.
has rung
B.
had rung
C.
has been ringing
D.
is ringing
【单选题】My telephone has rung so often today that it is becoming a(n) ______.
A.
interruption
B.
bore
C.
distress
D.
nuisance
【单选题】I was about to the phone when it was . [ ]
A.
reply; rung of
B.
receive; rung up
C.
answer; rung off
D.
answer; rung up
【简答题】居住区绿地规划设计 名仕华庭(底图).dwg 居住区绿地景观设计指导书.doc
【单选题】People in the block where the fire bell has rung must gather for a check of names ________.
A.
in another block
B.
in the administration office
C.
in one of the playing fields
D.
in the sports hall
【单选题】The collapse of Enron, the largest bankruptcy in American history, has rung out a banner year for American business failures. In Europe, the fallout from the Swissair and Sabena insolvencies continues...
A.
triggers grand-scale economic recession in America.
B.
affects the Swissair and Sabena in Europe.
C.
marks the most dramatic economic situation in America.
D.
gets more companies into trouble around the world.
【简答题】居住区绿地规划设计
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