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【简答题】
HC-SR501 模块具有什么特点?当其感应到人体活动时,输出高电平还是低电平?
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反馈参考答案：
举一反三
【单选题】Before Sept. 11, the U.S. Congress had been unable to pass stricter immigration laws because.
A.
they might have kept away foreign students and cheap labor
B.
it was difficult to coordinate the efforts of the congressmen
C.
education and business circles cared little about national security
D.
resources were not available for their enforcement
【多选题】U.S. laws requiring that drivers wear seat belts have resulted in
A.
a reduction in both driver deaths and pedestrian deaths.
B.
fewer accidents and fewer deaths per accident.
C.
fewer driver deaths, fewer accidents and fewer pedestrian deaths.
D.
little change in the number of driver deaths, but more accidents.
E.
an increase in the number of accidents.
F.
safer driving.
【单选题】Before Sept.11, the U.S. Congress had been unable to pass stricter immigration laws because ________.
A.
education and business circles cared little about national security
B.
resources were not available for their enforcement
C.
it was difficult to coordinate the efforts of the congressmen
D.
they might have kept away foreign students and cheap labor
【单选题】Why are there laws made against smoking in public places in the U.S.?
A.
Because people have realized the er of second-hand smoke.
B.
Because more and more people don't like smoking now.
C.
Because parents don't want their children to become smokers.
D.
Because the government wants to limit the production of cigarettes.
【单选题】患者女性,26岁。因淋雨后出现高热、畏寒、咳嗽、流涕就诊。医生开出以下口服药,护士嘱咐患者应最后服用的是
A.
布洛芬
B.
止咳糖浆
C.
清开灵口服液
D.
头孢呋辛
【单选题】Before Sept 11, the U.S. Congress had been unable to pass stricter immigration laws be- cause______.
A.
they might have kept away foreign students and cheap labor.
B.
it was difficult to coordinate the efforts of the congressmen.
C.
education and business circles cared little about nation.
D.
resources were not available for their enforcement.
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