关于子宫内膜异位症的预防，哪项是禁忌的（） A.防止经血倒流

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问题单项选择题

关于子宫内膜异位症的预防，哪项是禁忌的（）

A.防止经血倒流

B.月经期应避免不必要的盆腔检查

C.避免手术操作时引起的内膜种植

D.人工流产时，不要突然降低负压

E.输卵管通液术，应在月经前期进行

答案

参考答案：E

阅读理解

阅读理解。

Li Ming came to school in Canada. He learns many things. He always takes a school bus to school. He

works hard at school. Winter is coming. Snow is falling. Li Ming likes winter in Canada. He likes to make

snowmen in Canada. He plays with snowmen with Jenny and he teaches Jenny to ski. Jenny learns fast. They

are very happy. He thinks winter is so fun.

根据短文内容判断正(T)误(F)。

( ) 1. Li Ming came to school in Canada.

( ) 2. He always walks to school.

( ) 3. He likes to make snowmen in China.

( ) 4. He works hard at school.

( ) 5. He doesn't teach Jenny to learn.

单项选择题

EDFA中使用的光滤波器的作用是滤除光放大器中的（）。

A.色散

B.能量

C.时延

D.噪声