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【判断题】
磁导率就是用来衡量介质导磁能力的物理量。
A.
正确
B.
错误
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【简答题】图示为一台小型发电机的示意图 , 矩形线圈在匀强磁场中绕 OO' 轴匀速转动 , 磁场方向与转轴垂直。矩形线圈的面积 S= 2 . 0 × 10 - 2 m 2 , 匝数 N= 40, 线圈电阻 r= 1 . 0 Ω, 磁场的磁感应强度 B= 0 . 20 T 。线圈绕 OO' 轴以 ω= 100 rad / s 的角速度匀速转动。线圈两端外接电阻 R= 9 . 0 Ω 的小灯泡和一个理想交流电流...
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【单选题】What do the two persons want to do?
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【简答题】听下面一段材料，回答第1-4小题。 1. How many persons were there in the room when someone was knocking at the door? [     ] A. One person. B. Two persons. C. Three persons. 2. What did the young man wear? [     ] A. ...
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【单选题】一个矩形线圈在匀强磁场中绕垂直于磁感线的轴匀速转动,穿过线圈的磁通量随时间变化的图象如图 9 甲所示,则下列说法中正确的是 ( )
A.
． t ＝ 0 时刻，线圈平面与中性面垂直
B.
． t ＝ 0.01 s 时刻， Φ 的变化率最大
C.
． t ＝ 0.02 s 时刻，交变电动势达到最大
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．该线圈产生的相应交变电动势的图象如图乙所示
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【单选题】进气歧管绝对压力传感器是一种 测量空气流量的传感器。
A.
直接
B.
间接
C.
快速
D.
低速
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【简答题】Two persons start from the same location O and walk around a square in opposite directions with constant speeds. The square is 30m by 30m. A’s speed is 2m/s and B’s speed is 1m/s. Find the coordinates...
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【单选题】进气歧管绝对压力传感器是一种( )测量空气流量的传感器
A.
直接
B.
间接
C.
慢速
D.
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【简答题】图示为一台小型发电机的示意图 , 矩形线圈在匀强磁场中绕 OO' 轴匀速转动 , 磁场方向与转轴垂直。矩形线圈的面积 S= 2 . 0 × 10 - 2 m 2 , 匝数 N= 40, 线圈电阻 r= 1 . 0 Ω, 磁场的磁感应强度 B= 0 . 20 T 。线圈绕 OO' 轴以 ω= 100 rad / s 的角速度匀速转动。线圈两端外接电阻 R= 9 . 0 Ω 的小灯泡和一个理想交流电流...
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【单选题】What do the two persons want to do?
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【简答题】听下面一段材料，回答第1-4小题。 1. How many persons were there in the room when someone was knocking at the door? [     ] A. One person. B. Two persons. C. Three persons. 2. What did the young man wear? [     ] A. ...
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A.
． t ＝ 0 时刻，线圈平面与中性面垂直
B.
． t ＝ 0.01 s 时刻， Φ 的变化率最大
C.
． t ＝ 0.02 s 时刻，交变电动势达到最大
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．该线圈产生的相应交变电动势的图象如图乙所示
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【单选题】进气歧管绝对压力传感器是一种 测量空气流量的传感器。
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直接
B.
间接
C.
快速
D.
低速
查看完整题目与答案
【简答题】Two persons start from the same location O and walk around a square in opposite directions with constant speeds. The square is 30m by 30m. A’s speed is 2m/s and B’s speed is 1m/s. Find the coordinates...
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