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【单选题】
称取纯As 2 O 3 0.2473g,用NaOH溶解后,再用H 2 SO 4 将此溶液酸化,以待标定的KMnO 4 溶液滴定至终点时,消耗溶液25.00ml,KMnO 4 溶液的浓度为A.
0.01000mol/L
B.
0.2000mol/L
C.
0.1000mol/L
D.
0.04000mol/L
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举一反三
【简答题】Although Margie was swimming so well, she failed to win the first prize and had to ___________ the second.
【单选题】We mustnt rely on sheer enthusiasm and substitute our personal feelings for policy. The underlined part means______.
A.
replace
B.
shelter
C.
resign
D.
reinforce
【单选题】If you are the judge, you must ______ your personal feelings.
A.
set at
B.
set beside
C.
set out
D.
set aside
【单选题】下列叙述与硫酸阿托品不符合的是
A.
是选择性的M受体拮抗剂
B.
碱性条件下易水解
C.
临床使用的为左旋体的阿托品
D.
阿托品分子结构中含有4个手性碳原子
E.
可以用于治疗平滑肌痉挛导致的内脏绞痛
【简答题】A．To make the class more active. B．To leave personal feelings behind. C．To give wonderful lectures. D．To make friends with students.
【单选题】Although Margie was swimming so well, she failed to win the first prize and had to ____ the second.
A.
set
B.
let
C.
settle for
D.
for
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