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【多选题】关于霍尔式传感器,以下说法正确的有:()
A.
霍尔元件在线性梯度磁场中移动,所得霍尔电势与位移成正比。
B.
可以采用“并联电阻”的方法,实现霍尔元件不等位电压的补偿。
C.
霍尔元件转换效率高,受温度影响小,适于各种大位移的测量。
D.
霍尔元件控制电流端的引线通常用红色导线。
【单选题】在总账系统中查询未记账凭证科目汇总表时，屏幕上背景为蓝色的数据具有辅助核算，这时单击工具栏()按钮，可以查看其明细信息。
A.
“专项”
B.
“查询”
C.
“详细”
D.
“转换”
【单选题】在总账系统中查询未记账凭证科目汇总表时，背景颜色为深色的记录具有辅助核算，这时单击工具栏上的______按钮，可以查看其明细信息。
A.
“查询”
B.
“专项”
C.
“详细”
D.
“定位”
【单选题】在多普勒效应模型中，若一架飞机以v=400m/h的速度飞向一观察者，观察者静止不动，若飞机发射声波的频率fs=1，声速vs=757m/h，那么观察者接收到的声波频率为（ ）
A.
1.53
B.
0.47
C.
2.12
D.
0.65
【单选题】Section ADirections: In this section, you will hear 8 short conversations and 2 long conversations.At the end of each conversation,one or more questions will be asked about what was said. Both the con...
A.
Because the woman want to write something about Apollo 11.
B.
Because the woman doesn't want to continue her former paper topic
C.
Because the woman has found an interesting job.
D.
Because the woman showed him some pictures on her thesis.
【单选题】Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the ...
A.
She conducted the classical chapters pretty well.
B.
The chapters she composed and conducted were all in harmony.
C.
She composed the harmonious chapters by herself.
D.
The classical chapters composed by her were in harmony.
【简答题】阅读理解。 Several years ago, my family gathered on Cape Cod for a weekend. My parents were there, my sister and her daughter too, two cousins and, of course, my wife, my son and me. We ate at one of those...
【单选题】在多普勒效应模型中，若一架飞机以v=400m/h的速度飞向一观察者，观察者静止不动，若飞机发射声波的频率fs=1，声速vs=757m/h，那么观察者接收到的声波频率为（）(声源接近观察者时【图片】)
A.
1.53
B.
0.47
C.
2.12
D.
0.65
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