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【简答题】
描述某系统的微分方程为 y”(t) + 5y’(t) + 6y(t) = f(t) ,求当 f(t)=2e –t , t ≥ 0 ; y(0+)=2 , y’(0+)= -1 时的解。
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【简答题】There is a famous English saying 'You are what you eat', and it means what you put in your mouth will become part of you. Many experts（专家） use it to tell people it's important to have a good eating ha...
【单选题】女,25岁,面色苍白,发热10天,皮肤上见多个紫色片状改变,不凸出皮面,压之不褪色,直径约为6mm,应诊断为
A.
瘀点
B.
瘀斑
C.
血肿
D.
紫癜
E.
玫瑰疹
【多选题】在下面横线上填上合适的语句,完成 一个逻辑电路的设计,其布尔方程为 Y=(A+B)(C⊙D)+(B⊕F). LIBRARY IEEE; USE IEEE.STD_LOGIC_11.ALL; ENTITY COMB IS PORT(A, B,C,D,E,F,: IN STD_LOGIC; Y: OUT STD_LOGIC); END COMB; ARCHITECTURE ONE OF COMB...
A.
OR B) AND (C 1 D) OR (
B.
2 F); END ARCHITECTURE ONE;
【简答题】Architecture one of sample is variable a,b,c:integer; 上面VHDL语句中的错误在于( )。
【简答题】In the southern part of America, when somebody has a birthday, often family or friends, or both, will arrange a party. The party could be elaborate(精心准备的)and include a meal or may be with a bir...
【单选题】If a student doesn't understand an important part of the lesson, he or she__________.
A.
will never be a good student
B.
should ask another student for class notes
C.
should get a perfect score
D.
should ask the instructor to explain it
【单选题】女,25岁,面色苍白,发热10天,皮肤上见多个紫色片状改变,不凸出皮面,压之不褪色,直径约为6mm。应诊断为
A.
瘀点
B.
瘀斑
C.
血肿
D.
紫癜
E.
出血点
【单选题】Which of the following is TRUE according to the passage?
A.
If you like your career, you will be motivated to do it well.
B.
If you have chosen a good career, you will be interested in it.
C.
If you like your career, you must do it well.
D.
If you find it difficult to enter a good career, you must wait.
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