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【单选题】
在 25 °C 时,向 20.0mL 的某浓度盐酸中滴加氢氧化钠溶液,溶液的 pH 与所加氢氧化钠溶液的体积如图所示,下列有关说法错误的是A.
溶液中发生的反应为置换反应
B.
b 、 d 点对应溶液的 pH ： b
C.
向 c 点对应的溶液中滴加石蕊溶液，溶液呈紫色
D.
d 点对应的溶液中溶质是 NaCl 和 NaOH
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【单选题】健壮性边界值测试法,测试成绩录入,成绩范围0=
A.
0,1,99,100
B.
0,1,2,98,99,100
C.
-1,0,1,99,100,101
D.
0,1,100,101
【单选题】非健壮性边界值测试法,测试成绩录入,成绩范围0=
A.
0,1,99,100
B.
0,1,2,98,99,100
C.
-1,0,1,99,100,101
D.
0,1,100,101
【单选题】What makes a major success in Los Angeles is the strength of his public support.
A.
concentration
B.
intensity
C.
conservation
D.
stress
【简答题】C On May 29, 1973, Thomas Bradley, a black man, was elected mayor of Los Angeles. Los Angeles is the third largest city in the United States, with a population of three million. About six percent ...
【单选题】What makes a mayor successful in Los Angeles is the strength of his public support.
A.
concentration
B.
intensity
C.
conservation
D.
stress
【单选题】Injuries and deaths were relatively less in Los Angeles because the quake occurred at 4:31 a.m. on a holiday, when traffic was light on the city’s highways. In addition, changes made to the constructi...
A.
new computers had been installed in the buildings
B.
it occurred in the residential areas rather than on the highways
C.
large numbers of Los Angeles residents had gone for a holiday
D.
improvements had been made in the construction of buildings and highways
【单选题】Injuries and deaths were relatively less in Los Angeles because the quake occurred at 4:31a.m.on a holiday when traffic was light on the city's highways. In addition, changes made to the constructions...
A.
new computers had been installed in the buildings
B.
it occurred in the residential rather than on the highways
C.
large numbers of Los Angeles residents had gone for a holiday
D.
improvements had been made in the construction of buildings and highways
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