[在线考核] 齐次线性微分方程组 dY/dx=A(x)Y的线性无关解的个数不能多于n个. 日期：2021-07-15 12:29:29 点击：162 好评：0
(判断题)49: 齐次线性微分方程组 dY/dx=A(x)Y的线性无关解的个数不能多于n个. A: 错误 B: 正确 ...
[在线考核] 函数1，t,t^2,t^3在任何区间都是线性相关的 日期：2021-07-15 12:29:13 点击：167 好评：0
(判断题)31: 函数1，t,t^2,t^3在任何区间都是线性相关的 A: 错误 B: 正确 ...
[在线考核] 方程y''+4y=0的基本解组是cos2x,sin2x. 日期：2021-07-15 12:28:53 点击：88 好评：0
(判断题)19: 方程y''+4y=0的基本解组是cos2x,sin2x. A: 错误 B: 正确 ...
[在线考核] I’m going to Xi'an next week. Have you anything __ 日期：2021-07-15 12:25:29 点击：66 好评：0
(单选题)47: I’m going to Xi'an next week. Have you anything ____________to your parents? A: to take B: to be taken C: to be bought to D: to buy ...
[在线考核] It ____________ whether he will go on with his study at the 日期：2021-07-15 12:20:02 点击：195 好评：0
(单选题)33: It ____________ whether he will go on with his study at the university. A: hasn't been decided B: isn't decided C: hasn't decided D: doesn't decide ...
[在线考核] In such dry weather, the flowers will have to be watered if 日期：2021-07-15 12:19:35 点击：51 好评：0
(单选题)27: In such dry weather, the flowers will have to be watered if they____________. A: have survived B: are to survive C: would survived D: will survive ...
[在线考核] Four hours______ too long for him to write the letter. 日期：2021-07-15 12:18:53 点击：184 好评：0
(单选题)15: Four hours______ too long for him to write the letter. A: has B: are C: is D: have ...
[在线考核] This new clue _______ the policemen and they were more confu 日期：2021-07-15 12:18:31 点击：56 好评：0
(单选题)9: This new clue _______ the policemen and they were more confused by the murder. A: puzzled B: surprised C: trapped D: discouraged ...
[在线考核] Why____ with him? He’ll never change his mind. 日期：2021-07-15 12:15:58 点击：181 好评：0
(单选题)11: Why____ with him? He’ll never change his mind. A: argued B: argue C: arguing D: to argue ...
[在线考核] They will____to Paris next year. 日期：2021-07-15 12:14:55 点击：158 好评：0
(单选题)43: They will____to Paris next year. A: trip B: get C: visit D: travel ...
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