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【简答题】
微分方程即是描述 系统的数学模型, 而 是描述离散时间系统的数学模型。
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】I was (感到疑惑,想知道)_________if you are free for lunch.
A.
thinking
B.
wandering
C.
wondering
【单选题】--If you are free on Sunday, would you like to come to our English Evening? -- ______
A.
I'd like to, but I have to go to see my grandmother.
B.
Have a good time.
C.
Somebody wants you on the phone.
D.
Oh, never mind.
【单选题】— If you are free, go skating with us, OK? — ______. [ ]
A.
Not at all.
B.
Sure, I'd love to.
C.
No, I don't like you.
D.
That's right.
【单选题】某患者因腹泻、呕吐入院,心电图提示 ST 段水平压低, T 波倒置, U 波增高。最可能的病因是
A.
高钾血症
B.
低钾血症
C.
高钙血症
D.
洋地黄效应
E.
洋地黄中毒
【单选题】某患者因腹泻、呕吐入院,心电图提示 ST 段水平压低, T 波倒置, U 波增高。最可能的病因是
A.
高钾血症
B.
低钾血症
C.
低氯血症
D.
低钙血症
E.
高钠血症
【单选题】I would be happier if you did more studying while you are free, but you ___________.
A.
don’t
B.
didn’t
C.
wouldn’t
D.
weren’t
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