【单选题】在一中空圆柱面上绕有两个完全相同的线圈aa′和bb′,当线圈aa′和bb′如图(1)绕制及联结时,ab间自感系数为L1;如图(2)彼此重叠绕制及联结时,ab间自感系数为L2.则
A.L1 = L2 =0.
B.L1 = L2 ≠ 0.
C.L1 = 0,L2 ≠ 0.
D.L1 ≠ 0,L2 = 0.
- · 有4位网友选择 C,占比36.36%
- · 有4位网友选择 D,占比36.36%
- · 有2位网友选择 B,占比18.18%
- · 有1位网友选择 A,占比9.09%
A.L1 = L2 =0.
B.L1 = L2 ≠ 0.
C.L1 = 0,L2 ≠ 0.
D.L1 ≠ 0,L2 = 0.
A、reserves in the banking system increase.
B、reserves in the banking system decline.
C、Federal Reserve liabilities remain unchanged.
D、Federal Reserve liabilities decline.
A、solution
B、articulation
C、appreciation
D、speculation
A、the price of autos within the nation will rise by 10 percent.
B、the price of autos within the nation will rise by more than 10 percent, because of high effective protection.
C、the price of autos within the nation will rise, but by less than 10 percent because it is small nation.
D、the price of autos will not rise because of internal competition.
A、it is an independent section
B、it is a composing part of a section
C、it can either be an independent section or a composing part of a section
D、it can replace the conclusion section
A、F21 =2F12.
B、F21 >F12.
C、F21 =F12.
D、F21 =F12.
A、总磁能将增大.
B、总磁能将减少.
C、总磁能将保持不变.
D、总磁能的变化不能确定.
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