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问题 单项选择题

发动机的离心提前点火装置中，有机械式飞块弹簧，有关弹簧的说法正确的是（）。

A、有两根相同的弹簧

B、有两根软硬不一的弹簧

C、只有一根弹簧

D、有三根弹簧，一硬二软

答案

参考答案：B

阅读理解

阅读理解。

这是Jim写的家庭简介，你能帮助他完成一份家谱吗?

     My name is Jim. I have a big family. There are six people(人) in my family. My grandfather is a doctor.

My grandmother is a nurse. They work in the same hospital. (同一家医院) My father and mother are teachers

in No. 11 Middle School. My father teaches Chinese, but my mother is an English teacher. Kate is my sister.

We are new students in No. 11 Middle School. My grandparents and parents like (喜欢) us and we like our

family. We are very happy.

     Family Tree (家谱)

1. _____________ 2. _____________ 3. _____________ 4. _____________ 5. _____________

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单项选择题 A型题

血液缓冲系统中最重要的是（）

A.血浆蛋白缓冲系统

B.磷酸盐缓冲系统

C.碳酸氢盐缓冲系统

D.血红蛋白缓冲系统

E.氧合血红蛋白缓冲系统
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