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【单选题】
符合硫酸阿托品理化性质的叙述是（）。A.
不溶于乙醇
B.
不易被水解
C.
水溶液呈中性
D.
呈旋光性，供药用的为左旋体
E.
可与氯化汞作用生成紫色沉淀
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【单选题】We should call on people _______ some protective measures _____ protect their from_______
A.
to make, to , being infected
B.
to make , in order to , infection
C.
to take , in order that ,being infected
D.
to take , so as to , being infected
【简答题】My family is not very large. There are only three cats. I’m a white cat. People call me Snow-white. My husband is a black cat. People call him Captain Black Cat. ( 黑猫警长 ) We have a beautiful daughter....
【单选题】氧化还原滴定指示剂说法错误的 是( )
A.
KMnO 4 过量半滴，溶液呈淡色为终点。
B.
高锰酸钾是一种自身氧化还原指示剂。
C.
直接碘量法是蓝色消失，间接碘量法是蓝色出现。
D.
碘量法中淀粉与 I 2 生成一种蓝色化合物，借蓝色指示终点。
【单选题】听力原文： The native Americans, the people we call the 'Indians' had been in America for many thousands of years before Columbus arrived in 1492. The Indians were kind to the early settlers. They taught t...
A.
Friendly.
B.
Estranged.
C.
Hostile.
D.
Indifferent.
【简答题】KMnO 4 法是氧化还原滴定法中的一种,该法采用 _________ 作标准溶液。 这种溶液用间接配制法配制,常用基准物质 标定,在滴定中使用_________作指示剂。
【单选题】The native Americana, the people we call the ' Indians', had been in America for many thousands of years before Christopher Columbus arrived 【61】 1492. The Indians were kind to the early 【62】 They tau...
A.
at
B.
in
C.
for
D.
since
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