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问题 单项选择题

男，60岁。有支气管哮喘病史，近日血压高达180／105 mmHg。治疗时应禁用的药物是

A．钙通道拮抗剂

B．血管紧张素转换酶抑制剂

C．血管紧张素Ⅱ受体拮抗剂

D．利尿剂

E．β肾上腺受体拮抗剂

答案

参考答案：E

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阅读短文，选择正确答案。

      You may know all the names of the sportsmen. You may also know what sports they are good at. They

are all very good Chinese sportsmen. Let me tell you more about them. Yao Ming is older than Liu Xiang and

Wang Hao. But he is younger than Tian Liang. Yao Ming is 226cm tall. He is taller than other three. He is also

heavier. He is 140.6kg. He looks stronger. Tian Liang is older than the other three, but he is shorter and smaller.

Wang Hao is a little younger and shorter than Liu Xiang. Liu Xiang runs faster than the others.

1. YaoMing is a _______________ player.

A. football

B. basketball

C. volleyball

2. Who is the tallest?  _______________.

A. Yao Ming

B. Liu Xiang

C. Wang Hao

3. YaoMing is _______________ and _______________ than the other three.

A. shorter, heavier

B. older, taller

C. taller, heavier

4. They are from _______________.

A. Chinese

B. China

C. America

5. LiuXiang is good at _______________.

A. running

B. swimming

C. basketball
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问答题

设某计算机系统有一块CPU、一台输入设备、一台打印机。现有两个进程同时进入就绪状态，且进程A先得到CPU运行，进程B后运行。进程A的运行轨迹为：计算50ms，打印信息100ms，再计算50ms，打印信息100ms，结束。进程B的运行轨迹为：计算50ms，输入数据80ms，再计算100ms，结束。试画出它们的时序关系图(可以用甘特图)，并说明：

开始运行后，CPU有无空闲等待若有，在哪段时间等待计算CPU的利用率。
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