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【判断题】
年金可以视为期限趋于无穷的普通年金A.
正确
B.
错误
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【简答题】Bob is happy. He is at a new school, and the other students are friendly.“Hi, Bob!” they say. But some students say,“Hi, Peter!” Bob doesn't understand. He asks another student, "why do some students ...
【判断题】The term “peer review” suggests that we can discuss with our classmates about our academic papers.
A.
正确
B.
错误
【简答题】阅读短文，判断正误，对的打T，错的打F。 Look at this boy. He is an English boy. His first name is Peter. His last name is Barnes. This is his school. His school ID card number is two-zero-zero-four-eight-five-six-seven....
【单选题】听力原文：Payday is every two weeks, isn't it? (A) Yes, I always look forward to that. (B) You can find it everywhere. (C) Peter is in charge of payroll. (18)
A.
B.
【简答题】波长为600nm的单色光垂直入射在一光栅上，第二、第三级主极大明纹分别出现在sinθ=0.2及sinθ=0.3处，第四级缺级，求： （1）光栅常数； （2）光栅上狭缝的宽度； （3）屏上一共能观察到多少根主极大明纹？
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