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【单选题】
研究儿童自我控制能力和行为的实验是A.
点红实验
B.
延迟满足实验
C.
三山实验
D.
陌生情境实验
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举一反三
【简答题】病原体可通过鸡胚垂直传播的禽病毒性传染病有()()()()。
【单选题】What statement best describes a proximity sensor?
A.
An electronic switch that activates when in close proximity to a target
B.
A relay that activates when in close proximity to a target
C.
A solenoid that activates when in close proximity to a target
D.
A mechanical limit switch used to sense proximity of a target
【单选题】What statement best reflects the myth of rationality?
A.
Emotions are an inseparable part of everyday life.
B.
The work world has tried to keep a damper on emotions at work.
C.
Emotions are a normal part of rationality.
D.
Emotions are a constructive part of organizations.
【多选题】某中心小学4天有6名学生相继出现低热乏力、恶心、尿黄。校方将有关信息报告至当地疾病预防控制中心，疾控中心立即指派专人赶赴现场进行了调查。提示：6名学生检查结果显示，抗HAVIgM均为阳性。本次症疫情确定为甲肝暴发。关于甲型肝炎病毒的传播，以下说法正确的是（）。
A.
日常生活接触也是HAV传播的主要途径
B.
经水传播是卫生条件较差地区流行的重要原因
C.
生食海产品时用开水冲烫可以杀死HAV
D.
可有母婴垂直传播
E.
可以经受污染的食品传播
F.
主要通过粪-口途径传播
【单选题】What statement best describes the notion of effectively final in Java?
A.
A local variable that is marked final .
B.
A local variable that is marked final .
C.
A local variable that is not marked final but whose primitive value or object reference does not change after it is initialized .
D.
A local variable that is not marked final but whose primitive value or object reference does not change after a certain point in the method .
【单选题】What statement best describes modulation?
A.
Imposing intelligence onto a radio carrier signal.
B.
Changing mark-space to 1 and 0.
C.
Adjusting the frequency to the optimum band for long distance communications.
D.
Converting the carrier from a low frequency to a higher frequency.
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