若手术时必须切断肛管直肠环时，以下操作哪一项是正确的： A．

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问题单项选择题

若手术时必须切断肛管直肠环时，以下操作哪一项是正确的：

A．在前正中线切断

B．在后正中线切断

C．同时在肌肉环两处以上切断

D．切开后用纱布填塞

E．以上均正确

答案

参考答案：B

填空题

首字母填空，根据句意及首字母提示完成句子，每空一词。

Hi, I am Millie. This is Nan Nan. She is one of my(1)b_______ friends in China. She is my true friend. She(2)n______

tells others my secrets. She is a good girl(3)b______ she has poor eyesight. She likes watching TV and reading books

(4)i________ bed. She always (5)w______ funny glasses. She likes(6)s_______ and she is a fan of Liu Ruoying. At

(7)w________, she likes to go shopping in the supermarket. Sometimes she doesn't buy(8)a_________. But she says,

"It is very important for all of you to be in a good mood(心情)and enjoy(9)y_________."We must have some good

friends. When you need help, you may think of (10)y_______ best friend. Do you agree with me?

1. _____ 2. _____ 3. _____ 4. _____ 5. _____ 6. _____ 7. _____ 8. _____ 9. _____ 10. _____

选择题

A．通过R_T的电流

B．通过R₁的电流

C．通过R₂的电流

D．电容器两极板间的电场强度