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【单选题】
当溶液的pH=pKHIn时，称为酸碱指示剂的（ ）；而pH=pKHIn±1称为指示剂的（ ）。A.
理论变色点；理论变色范围
B.
终点；终点误差
C.
理论变色点；实际变色点
D.
终点；终点变色范围
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【单选题】What happens on the day before the sports day?
A.
Many people wear colored clothes.
B.
The sports field is well prepared for the special event.
C.
People are having a big festival.
【单选题】What happens on the day before the sports day?
A.
Many people wear colored clothes.
B.
The sports field is well prepared for the special event.
C.
People decorate houses to celebrate the big festival.
【单选题】What happens on the day before the sports day?
A.
Many people wear coloured clothes.
B.
The sports field is well prepared for the special event.
C.
People decorate houses to celebrate the big festival.
【单选题】What happens on the day before the sports day?
A.
Many people wear colured clothes.
B.
The sports fields is well prepared for the special event.
C.
People decorated houses to celebrate the big festival.
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