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【单选题】
实验中测定自来水中 Ca 2+ 含量时,调节 pH=12 ,使 Mg 2+ 形成 Mg(OH) 2 ,利用的是( )。A.
沉淀掩蔽
B.
配位掩蔽
C.
氧化还原掩蔽
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举一反三
【单选题】—________ you leave now? You only arrived an hour ago! —Sorry, but so much homework is waiting for me.
A.
Must
B.
May
C.
Can
D.
Might
【单选题】You should check ( ) if you want to know ( ) at the scenic spot.
A.
thePublic Signs of the Map for the Scenic Spot; what you could do
B.
the Public Signs of the Code of Conduct at the Scenic Spot; where you are
C.
the Public Signs of the Code of Conduct at the Scenic Spot; who you could be
D.
the Public Signs of the Code of Conduct at the Scenic Spot; what you could do
【单选题】You must keep it secret、It is only _______ you and me.
A.
for
B.
to
C.
among
D.
between
【单选题】Can you ______ any smell of the gas which is escaping?
A.
discover
B.
detect
C.
find
D.
spot
【简答题】Can you spot any differences between these two pictures?
【简答题】翻译句子 .Can you spot any differences between these two pictures?
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