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问题 填空题

重为2N的小球静止在水平面上如图所示，作出小球所受支持力的示意图．

答案

对小球受力分析，受重力、支持力，按要求作出水平面对小球的支持力，方向是竖直向上的，标出力的大小2N，如图所示；

句型转换

句型转换。

1. I think he will come back soon. (否定句)

    I _______  think he _______ come back soon.

2. The classroom is opposite the library.(对划线部分提问)

    _______ the classroom?

3. He went to school by underground yesterday.   (对划线部分提问)

    _______ _______ he _______ to school yesterday?

4. How is the weather in your home town in summer? (同义句)

    _______ the weather _______ in your home town in summer?

5. It's only ten minutes from my home to school by bicycle. (同义句)

    It _______ only ten minutes _______ ride to school.

6. Do you know where we can get the information?  (同义句)

   Do you know where  _______  _______ the information?
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单项选择题

女性，65岁。突发上腹痛3h，伴心悸、恶心、呕吐，第一心音强弱不等，心电图P-P间期1．44s，ST段Ⅱ、Ⅲ、aVF抬高0．2mV，呈QR型，有关此病人的症状错误的是：（）

A.恶心、呕吐与迷走神经受刺激和心排出量降低组织灌注不足有关

B.心电图ST段Ⅱ、Ⅲ、aVF导联抬高提示下壁心肌损伤

C.第一心音强弱不等是房室分离所致

D.心电图Ⅱ、Ⅲ、aVF，有病理性Q波，应考虑为陈旧性下壁心梗

E.上腹痛、恶心、呕吐等症状不是急腹症所致
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