题目内容

单台变压器的容量选择，不宜大于2000KVA。

A. 对
B. 错

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No horse has a speed c_____ to that of his. He often r_ to a dictionary when composing. He was a_ as England’s greatest modern painter. I can take you to the airport and see you o_. Susan is my c_, we were at school together. The p_ of the characters in the novel is lifelike. Oil will not m_____ with water.

符合甲型强心苷元结构特征的是（）

A. C/D环顺式稠合
B/C环反式稠合
C. A/B环顺式或反式稠合
D. C17连接五元不饱和内酯环

下列有关强心苷的溶解性正确的说法是（）

A. 强心苷可溶于乙醚
B. 强心苷可溶于乙醇
C. 次生苷亲水性强
D. 苷元亲脂性强

水解强心苷的苷元或糖上的酰基常用的碱有（）

A. 2%NaOH水溶液
B. 5%Ca(OH)2水溶液
C. 5%KOH水溶液
D. 5%NaHCO3水溶液