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【简答题】
以二甲酚橙 (XO) 为指示剂在六亚甲基四胺缓冲溶液中用 Zn 2+ 滴定 EDTA ,终点时溶液颜色由 __ 变为 ___ 。 标定 EDTA 溶液时,若控制 pH=5 ,常选用 为金属离子指示剂;若控制 pH=10 ,常 选用为金属离子指示剂
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【单选题】Even a single letter can ______ the meaning of the word it precedes.
A.
loan
B.
compensate
C.
estimate
D.
transform
【简答题】Directions: There are 2 passages in this section. Each passage is followed by some questionsor unfinished statements. For each of them there are four choices marked A), B), C) and D). You should decid...
【简答题】Section C Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You s...
【单选题】Tony as well as his brothers and sisters from America.
A.
are
B.
is
C.
were
D.
have been
【单选题】Part II Structure(10 minutes) Directions: This part is to test your ability to construct grammatically correct sentences. It consists of 2 sections. Section A Directions: In this section, there are 10...
A.
although
B.
despite
C.
though
D.
that
【单选题】Tony as well as his brothers and sisters _______ from America.
A.
is
B.
are
C.
were
D.
have been
【单选题】Section C Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You s...
A.
By building more reserves of groundwater.
B.
By drawing water from the depths of the earth.
C.
By developing more advanced drilling devices.
D.
By upgrading its water distribution system.
【单选题】Tony as well as his brothers and sisters______from America.
A.
is
B.
are
C.
have been
D.
were
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