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【简答题】
已知描述系统的微分方程为y"(t)+3y' (t) +2y(t) = f(t),初始状态y(0-) = 1,y' (0-) = 1,激励f(t) = ε(t),试求其0+值y(0+)和y'(0+)。答案形式为:2;2 (注:y(0+)在前,答案不需要使用公式编辑器,请在草稿纸上演算后填入答案)
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皮皮学刷刷变学霸
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【多选题】What do we usually talk about to start a conversation?
A.
Commenting on impersonal topics, such as the weather.
B.
Commenting on the activity we are participating in, such as the party.
C.
Interrupting at the right point into the conversation we are having.
D.
Asking about marital status
【单选题】What do we usually say on Easter?
A.
Merry Easter.
B.
Happy Easter.
C.
He is alive.
D.
He is risen.