【简答题】DC-DC变换降压斩波电路,如图1-3所示,若输入电压 、 占空比 ,则输出电压平均值 为 伏。
【简答题】Who is the writer of Text A Unit 1?
【单选题】If you did something that you now regret, you feel
A.
sorry about what happened.
B.
bored with what happened.
C.
good about what happened.
【简答题】玛莉在信中从未提及她的继母。 Mary really never mentions her step-mother in her ____________.
【简答题】已知点 , , 且 , ,求点 , 及向量 的坐标.
【单选题】1 Who is the writer of the Canterbury Tales!
【单选题】He wrote to his friends ______ information.