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问题 填空题

一个圆柱和一个圆锥的体积相等，底面积也相等，圆柱的高是7厘米，圆锥的高是______厘米．

答案

设圆柱的底面积是s，高是h，圆锥的底面积是s，高是b．

s×7=

1
3
sb

3s×7=sb

b=21

答：圆锥的高是21厘米．

故答案为：21．

单项选择题 A1/A2型题

女，36岁，诉剧烈自发性搏动性疼痛1天，遇冷暂时缓解，检查见远中面深龋，探痛，扣痛应诊断为（）

A.慢性根尖周炎

B.急性浆液性牙髓炎

C.急性牙周炎

D.急性化脓性牙髓炎

E.慢性牙髓炎急性发作
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单项选择题

A local-area network (LAN) is a communications network that (125) a variety of devices and provides a (126) for information exchange among those devices. The scope of the LAN is small typically a single building or a cluster (丛) of buildings. The LAN is usually owned by the same organization that owns the (127) devices. The internal data rate of LAN is at least several Mb/s.
The basic of LAN communication is broadcasting. At each station, there is a transmitter/receiver that communicates over a (128) shared, By other stations. A transmission from any one station is (129) to and received by all other stations.

A．adopted

B．attached

C．selected

D．unified
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