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【单选题】
欲配制pH=9．00的缓冲溶液，最好用( )。A.
NaHCO3一Na2CO3
B.
NaH2PO4一Na2HPO4
C.
HOAc—NaOAc
D.
NH3.H2O—NH4Cl
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反馈参考答案：
举一反三
【单选题】Maintenance activities include(74)。 ①making enhancements to software products ②developing a new software product ③correcting problems ④adapting products to new environments
A.
①②
B.
①③④
C.
②③④
D.
①②③④
【单选题】His car broke ________, so he has a plausible explanation as to why he is late.
A.
up
B.
out
C.
in
D.
down
【单选题】PON的全称是()
A.
PassiveOpticalNetwork
B.
PassiveOpenedNetwork
C.
PossibleOpticalNetwork
D.
PossibleOpenedNetwork
【单选题】“流沙河,红孩儿,地勇夫人,牛魔王,蜘蛛精,设入洞去,南海里,观世音,救出唐僧。”出自()
A.
《西游记》
B.
《朴通事谚解》
C.
《销释真空宝卷》
D.
《大唐大慈恩寺三藏法师传》
【单选题】While the percentage of urban residents is higher in relatively developed countries, developing countries have an increasing number of very large urban settlements. In 1950, only three of the ten larg...
A.
Adequate job opportunities.
B.
Better public facilities.
C.
Very poor economic conditions in rural settlements.
D.
An increase in rural population.
【单选题】Perhaps he__________writing, for he once was a brilliant writer.
A.
should stick on
B.
should stick with
C.
should have stuck to
D.
should have stuck on
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