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【单选题】
大肠癌的好发部位为A.
横结肠
B.
直肠壶腹部
C.
直肠
D.
乙状结肠
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【单选题】向含 1 mol Na 2 CO 3 的溶液中,通入 0.5 mol Cl 2 ,得 到 含有 NaClO的 溶 液, 有关 该 溶 液 的说法 中, 正确的是 ( )
A.
主要成分为NaCl、NaClO和NaHCO 3
B.
c ( Cl － ) = c ( ClO － )
C.
2 c ( Na + ) = c ( CO 3 2－ ) + c ( HCO 3 － ) + c ( H 2 CO 3 )
D.
c ( Na + ) = c ( Cl － ) + c ( ClO － ) +2 c ( CO 3 2－ ) + c ( HCO 3 － )
【单选题】设N A 为阿伏加德罗常数的值，则下列叙述正确的是
A.
1 mol 甲基中含有10N A 个电子
B.
1 mol Na 2 O 2 中含有阴 离子数为2 N A
C.
标准状况下，2.24升苯中含有的双键数为0.3N A
D.
1升0.1 mol/l 的Na 2 CO 3 溶液中co 3 2- 离子个数少于0.1N A
【单选题】设n A 为阿伏加德罗常数的数值。下列说法错误的是 [ ]
A.
1 mol NH 3 中含有3n A 个N-H键
B.
0.1 mol/L Na 2 CO 3 溶液中含有0.1n A 个CO 3 2-
C.
标准状况下，11.2 LCO 2 中含有n A 个O原子
D.
20 g重水( 2 1 H 2 O)中含有10n A 个电子
【单选题】听力原文：M: I couldn't put up with my wife any longer. I don't know why she always wants to look at everything in such a negative way and to discourage other people. W: Maybe you should try to get to know...
A.
The man's wife should try to be more understanding.
B.
The depression of the man's wife may be the result of her past experiences.
C.
The man's negative attitude may be derived from his childhood.
D.
It is easy for the man to help his wife out of pessimism.
【单选题】听力原文：M: I couldn't put up with my wife any longer. I don't know why she always wants to look at everything in such a negative way and to discourage other people. W: Maybe you should try to get to know...
A.
The man's wife should try to be more understanding.
B.
The depression of the man's wife may he the result of her past experiences.
C.
The man's negative attitude may be derived from his childhood.
D.
It is easy for the man to help his wife out of pessimism.
【单选题】用N A 表示阿伏加德罗常数，对生活中常见的物质下列说法中正确的是( )。
A.
含有1 mol Na 2 CO 3 溶液含有的CO 数为N A
B.
将58.5 g NaCl溶于1.00 L水中，所得NaCl溶液的浓度为1.00 mol· L －1
C.
1 mol 蔗糖(C 12 H 22 O 11 )在浓硫酸作用下完全脱水，转移的电子数为12N A
D.
常温下，10 L pH＝6的醋中含有的H ＋ 离子数为10 -5 N A
【简答题】氧气顶吹转炉吹炼中期,脱碳反应激烈,渣中氧化铁含量降低,如控制不好会使炉渣熔点升高和黏度加大,并可能出现粘稠,即为炉渣( )现象。
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