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【多选题】
网络营销的定价策略有A.
低价定价策略
B.
拍卖部份策略
C.
使用定价策略
D.
个性化定价策略
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反馈参考答案：
举一反三
【单选题】S1: Is there any difference between the new type and the old one？ S2: There is a solenoid valve in the starting system. Q: What is the difference between the new type and the old one? 02020dh004
A.
There is a solenoid valve in the starting system
B.
There is a solenoid valve in the fuel oil system
C.
There is a solenoid valve in the injection system
D.
There is a solenoid valve in the lubrication system
【单选题】The current flowing in a long thin solenoid is linearly increasing.
A.
The induced electric field exists only inside the solenoid.
B.
The induced electric field exists only outside the solenoid.
C.
The induced electric field exists both inside and outside the solenoid.
D.
No induced electric field exists both inside and outside the solenoid.
【单选题】A solenoid is 3.0 cm long and has a radius of 0.50 cm. It is wrapped with 500 turns of wire carrying a current of 2.0A. The magnetic field at the center of the solenoid is:
A.
9.9 × T
B.
1.3 × T
C.
4.2 × T
D.
10 T
【单选题】A small planar loop is placed inside a straight solenoid. When the angle between the normal direction of the loop and the axis of the solenoid is gradually increased from 0to 90 degree, how does the m...
A.
Does not change.
B.
Increases.
C.
Decreases.
D.
Decreases first and then increases.
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