In the following essay, each blank has four choices. Choose the best answer and write-down on the answer sheet.
Microwave communication uses high-frequency (29) waves that travel in straightlines through the air. Because the waves cannot (30) with the curvature of the earth, they can be (31) only over short distance. Thus, microwave is a good (32) for sending data between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of "dishes" or (33) . These can be installed on towers, highbuildings, and mountain tops.
33（）
A.repeaters
B.radars
C.telephones
D.antennas
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I like to with my pen pals. [ ]
A. speak
B. say
C. tell
D. talk
患者女，27岁。因欲自杀口服有机磷农药，被发现后，急送医院。体格检查：昏迷状态，呼吸困难，皮肤湿冷，双侧瞳孔如针尖样大小。
在治疗本病时应用阿托品，下列选项中阿托品治疗的有效指标不包括（）
A.口干、皮肤干燥
B.颜面潮红
C.心率加快
D.瞳孔较前缩小
E.肺部啰音减少或消失
锤式破碎机是利用高速旋转的铁锤对物料产生打击、冲击、（）和研磨而将物料粉碎的。
中央MISC的梦网业务受理端口的群发代码是（）。
A.10658166；
B.10658266；
C.10658186；
D.10658286；
经典计算机系统结构的实质是什么？