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【单选题】
What is the difference between the fields of phonetics and phonology?A.
Phonetics is mostly concerned with the production of vowels and consonants, while phonology is more about phenomena such as tone.
B.
Phonetics is the more general discipline concerned with all kinds of sounds, whereas phonology is specifically concerned with modern experimental methodologies.
C.
Phonetics is concerned with historical data, whereas phonology is concerned with how language is actually spoken.
D.
Phonetics is concerned with the physical and physiological aspects of sounds, while phonology is concerned with sounds as parts of language.
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【单选题】有一铜矿试样,测定其含水量为 1.00% ,干试样中铜的质量分数为 54.00% ,湿试样中铜的质量分数为
A.
54.10%
B.
55.00%
C.
53.46%
D.
53.00%
【多选题】下列关于直接滴定法测定阿司匹林含量的说法,正确的有
A.
反应摩尔比为1:1
B.
用氢氧化钠滴定液滴定
C.
以pH7的乙醇溶液作为溶剂
D.
以酚酞作为指示剂
E.
滴定时应在不断振摇下稍快进行
【多选题】下列关于直接滴定法测定阿司匹林含量的说法,正确的有
A.
反应摩尔比为1：l
B.
用氢氧化钠滴定液滴定
C.
以pH 7的乙醇溶液作为溶剂
D.
以酚酞作为指示剂
E.
滴定时应在不断振摇下稍快进行
【单选题】有一铜矿试样,测定其含水量为1.00%,干试样中铜的质量分数为54.00%,湿试样中铜的质量分数为
A.
54.10%
B.
53.46%
C.
55.00%
D.
53.00%
【单选题】有一铜矿试样测定其含水量为1.00%，干试样中铜的的质量分数为54.00%，湿试样中铜的质量分数为 （ ）
A.
54.10%
B.
53.46%
C.
55.00%
D.
53.00%
【单选题】有一铜矿试样,测定其含水量为1.00%,干试样中铜的质量分数为54.00%,湿试样中铜的质量分数为
A.
0.541
B.
0.5346
C.
55.00%
D.
0.53
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