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问题 填空题

根据给定的条件，匹配对应的结果：A—______，B—______，C—______，D—______，E—______。

  • A．最小极限尺寸-基本尺寸= ①公差
  • B．最大极限尺寸-基本尺寸= ②过盈配合
  • C．孔的尺寸大于配合轴的尺寸③上偏差
  • D．最大极限尺寸减去最小极限尺寸的绝对值 ④间隙配合
  • E．轴的尺寸大于配合孔的尺寸⑤下偏差

答案

参考答案：A—⑤ B—③ C—④ D—① E—②

单项选择题

In low-speed network, it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down. In high-speed networks, this approach often works poorly, because in the (1) between sending the notification and notification arriving at the source, thousands of additional (2) may arrive. In ATM network, a major tool for preventing (3) is (4) control. When a host wants a new virtual (5) ,it must describe the traffic to be offered and the service expected.

4（）

A．flow

B．admission

C．traffic

D．time
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单项选择题 B1型题

贫血患者杂音的机制是（）

A.瓣膜口狭窄

B.血流加速

C.异常通道

D.血管腔扩张

E.心腔内漂浮物
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