() allows the engine to be placed wherever is most suitable, as they no longer have to be aligned with reduction gearing and shafting as is the case with conventional installations.
A.
Diesel engine propulsion
B.
Diesel electric propulsion
C.
Steam engine propulsion
D.
Gas turbine propulsion
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【简答题】如图 1-28 所示电路中,已知 E 1 =12 V , E 2 =4 V , R 1 = R 2 =1 Ω , R 3 =4 Ω , R 4 =7 Ω 。求: ( 1 )当开关 S 断开时,流过电阻 R 4 的电流 I 及其电压 U ; ( 2 )当开关 S 闭合后,用叠加原理求解流过 R 4 的电流 I 。