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【单选题】
传感器的输出量通常为A.
非电量信号
B.
电量信号
C.
位移信号
D.
压力信号
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【简答题】Every day, about one-quarter of American s eat at fast-food restaurants. Cheap, tasty, and convenient, fast food is rich in fat and calories, and it’s low in fiber and nutrients. Thanks in large ...
【简答题】定常流动的流体所具有的机械能有 , , 。
【单选题】The data accumulated was obtained through______
A.
observation by social psychologists
B.
conversations with mothers of the children
C.
interviews, school records and physicians' reports
D.
observation of fathers with their children
【单选题】Children are sensitive to disapproval and adjust their behaviour______.
A.
accordingly
B.
conversely
C.
actually
D.
basically
【单选题】某大型城市综合体中的变配电间、计算机主机房、通讯设备间等场所内设置了组合分配式七氟丙烷气体灭火系统。下列关于该系统组件的说法中，错误的是（）。
A.
集流管应设置安全泄压装置
B.
选择阀的公称直径应和与其对应的防护区灭火系统的主管道的公称直径相同
C.
输送启动气体的管道宜采用铜管
D.
输送气体灭火剂的管道必须采用不锈钢管
【单选题】More than 50,000 electronics retailers and distributors are expected at the McCormick Convention Center in Chicago starting next Saturday. Some 1,300 manufacturers from more than 35 countries will exh...
A.
The McCormick Convention Center
B.
Chicago's convention centers
C.
Electronics retailers
D.
The Summer Consumer Electronics Show
【单选题】如图为某收音机的变频级，以下正确叙述是（ ）。【图片】
A.
电感三点式本机振荡电路
B.
双回路调谐放大器取出中频信号
C.
对接收信号构成共基放大电路
D.
以上说法都不对
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