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【单选题】
络合滴定法中所用的金属指示剂,应具备( )的条件。A.
指示剂与金属离子生成的络合物应该非常稳定
B.
指示剂与金属离子生成的络合物应有适当的稳定性
C.
金属指示剂与金属离子形成络合物的稳定性与EDTA与金属离子形成络合物稳定性相同
D.
金属指示剂与金属离子形成络合物的稳定性比EDTA与金属离子形成络合物稳定性强
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举一反三
【单选题】Advertising (falls into) two (main) (category): consumer advertising (and) trade advertising.
A.
falls into
B.
main
C.
category
D.
and
【单选题】Advertising falls (into) two (main) (category): consumer advertising (and) trade advertising.
A.
into
B.
main
C.
category
D.
and
【判断题】An advertising slogan for a photocopier is “We lead, others copy.” “Copy” here is used as a pun.
A.
正确
B.
错误
【单选题】The best title for the passage might be ______.
A.
Advertising Since the War
B.
Advertising and Manufacturers
C.
Advertising--England' s Biggest Industry
D.
Advertising and Purchasers
【单选题】Please allow me ( ) myself.
A.
introduced
B.
introducing
C.
to introduce
D.
introduction
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