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问题 单项选择题

琥珀胆碱属于

A．缩瞳药

B．合成解痉药

C．抗青光眼药

D．N2受体激动药

E．M受体阻断药

答案

参考答案：D

解析：
琥珀胆碱属于N2受体激动药，持续除极化，而导致骨骼肌松弛。

解答题

用圆规画一个半径2厘米的圆，先用字母标出圆心、半径和直径，再用红色笔标出周长，用蓝色笔标出圆面积．
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单项选择题

Microwave communication uses high-frequency (71) waves that travel in straightlines throughthe air. Because the waves cannot (72) with the curvature of the earth, they can be (73) only over short distance. Thus, microwave is a good (74) for sendingdata between buildings ina city or on a large college campus. For longer distances, the wavesmust be relayed by means of"dishes" or (75) . These can be installed on towers, highbuildings, and mountain tops.

A．reflex

B．distort

C．bend

D．absorb
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