皮皮学，免费搜题
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【单选题】
移动通信中采用的改善可靠性的方法有()A.
交织+卷积编码
B.
卷积编码
C.
分组编码
D.
奇偶编码
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举一反三
【单选题】I am very tired today. I _____ go to bed early. [ ]
A.
should
B.
shouldn't
C.
can
D.
can't
【单选题】听力原文：W: Go to bed early and get some rest, Jimmy. You have to get up early. M: But I can't. We're going to have an English test tomorrow morning. I must pass it this time. Q: What is the relationship ...
A.
Employer and employee.
B.
Teacher and student.
C.
Mother and son.
D.
Executive and clerk.
【判断题】设随机变量X与Y相互独立, 且X服从正态分布N(1,2), Y服从Gamma分布Ga(1,2), 则随机变量X^2-2X+16Y+1服从Gamma分布Ga(3/2, 1/8).
A.
正确
B.
错误
【判断题】设随机变量X与Y相互独立, 且X服从正态分布N(1,2), Y服从Gamma分布Ga(1,2), 则随机变量X^2-2X+16Y服从Gamma分布Ga(3/2, 1/2).
A.
正确
B.
错误
【简答题】不属于皮肤衍生物的结构是:
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