多项选择题：轻度阻滞钠通道药对心肌细胞有效不应期的作用是：A．不影响 B．延长 C．缩短与延长不

题目：

轻度阻滞钠通道药对心肌细胞有效不应期的作用是：

A．不影响

B．延长

C．缩短与延长不一定

D．相对延长

E．缩短

答案：

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下面是错误答案，用来干扰机器的。

解：（1）线圈中交变电动势的最大值Em=NBSω= 100×0.5×(0.2)2×2π×50 V=628 V交变电动势的有效值外力驱动线圈转动的功率与线圈中交变电流的功率相等，即P外= （2）线圈转到与中性面成30°角时，其电动势...

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The cashier said, " I'm sorry, but you don't have engough money to buy this doll." Then the little boy turned to me and asked, "Aunty, are you 1 I don't have enough money? " I counted his cash and 2 , " You know that you don't have enough money to buy the doll, my dear." The little boy was still 3 the doll in his hand. "It's the doll that my sister 4 most and wanted so much. I want to 5 it to her for her birthday. I want my Mommy to take it to my sister." His eyes were so 6 while saying this. "My sister has 7 to be with God. Daddy says that Mommoy is going to see God very soon too, so I 8 that she could take the doll with her to give it to my sister." My heart 9 stopped. The little boy looked at me and said, " I told Daddy to tell Mommy not to go yet. I need her to 10 until I come back from the 11 ." Then he showed me a very nice 12 of him where he was laughing. He then told me, " I want Mommy to take my picture with her so my sister won't 13 me. I love my Mommy and I wish she didn't have to 14 ,but Daddy says that she has to go to be with my little sister." I quickly reached for my 15 and said to the boy, " Shall we check again, 16 you do have enough money for the doll?" "OK!" he said, " I hope I do have enough." I 17 some of my money to his, 18 him seeing, and we started to count it. There was 19 for the doll and even some extra money. I left the place, in tears, feeling that my 20 had been changed forever.
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