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【简答题】
常用三类齐次边界条件的统一表达式是( )，当( )就是第一类边界条件；当( )时，就是第二类边界条件。
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反馈参考答案：
举一反三
【单选题】Which of the expressions do most people not like to hear to describe them?
A.
A big wig and a big wheel.
B.
A top banana and a kingpin.
C.
A big wheel and a top banana.
D.
A big wig and a kingpin.
【单选题】—Which do you think is better，tomatoes or potatoes —_______of them are delicious
A.
All
B.
Either
C.
Both
【单选题】–Which basketball player do you like best, Kobe, James or Jordan? -- _______ of them .Lin shuhao is my favorite.
A.
All
B.
None
C.
Either
D.
Neither
【单选题】. — Which of these electronic watches do you like? — ______of them. They are expensive and of little use.
A.
None
B.
All
C.
Both
D.
Either
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