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【单选题】
双指示剂法测定混合碱的含量,以酚酞作指示剂,用盐酸标准溶液滴定至第一终点时,消耗盐酸V1毫升,继续以甲基橙作指示剂,用盐酸标准溶液滴定至第二终点时,又消耗盐酸V2毫升,若V1>V2,则此混合碱的的组成是( )。A.
和
B.
和
C.
和
D.
只有
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皮皮学刷刷变学霸
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【单选题】M: Should we go out or eat in tonight? W: I am too tired to do any cooking. What does the woman mean?
A.
She is not hungry.
B.
She wants to cook.
C.
She is not tired.
D.
She wants to dine out.
【简答题】上图中, I s1 =1A, I s 2 =4A, I s 3 =7V,则 I s = I s1 + I s 2 + I s 3 =( )A。
【单选题】某台CT的空间分辨力为0.25mm,如用LP/cm表示,应为
A.
10LP/cm
B.
15LP/cm
C.
20LP/cm
D.
24LP/cm
E.
30LP/cm
【单选题】听力原文：W: Are you OK? You look really tired. M: I am. I cant seem to sleep at night. Ive been under a lot of pressure lately. W: Whats up? M: Ive got a million things to do. Im busy at work. Im working ...
A.
Learn to meditate or learn yoga.
B.
Walk to the supermarkets.
C.
Go mountain-climbing once a week.
D.
Take part in a bicycle race.
【简答题】9月20电商资源体验和简单站建设
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