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【多选题】
在下面有水滴定法的叙述中,正确的是( )。A.
质子自递常数越小的溶剂，滴定时溶液的 pH 变化范围越小
B.
LiAlH 4 常用作非水氧化还原滴定的强还原剂
C.
同一种酸在不同碱性的溶剂中，酸的强度不同
D.
常用电位法或指示剂法确定滴定终点
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【简答题】阅读理解。 A young woman carrying a three-year-old child got on a bus. The conductor hurried to give her a warm welcome and then kindly asked the other passengers to make more room for the woman and her ch...
【单选题】Heart rate of 2-year-old child is
A.
60~70 times per minute
B.
80~90 times per minute
C.
100~ 120 times per minute
D.
130~140 times per minute
E.
150~160 times per minute
【单选题】The 6-year-old child is old enough_______ himself.
A.
to dress
B.
to wear
C.
dresses
D.
wears
【单选题】Which number would you use to order a book for a 2-year-old child?
A.
0 7459 3892 2．
B.
0 7459 4056 0．
C.
0 7459 3952 X．
D.
0 7459 4578 3．
【单选题】Under no circumstances ______ be left alone at home.
A.
a three-year-old child should
B.
should a three-year-old child
C.
a three-year-old child should not
D.
should a three-year-old child not
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