设随机变量X服从参数为1/2的指数分布,则E(2X-1)=()
B.1
C.3
D.4
正确答案是C
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Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
Doctors are now using surgery to preserve ( ) in many people with a certain disease who would otherwise go blind. (eye, sight)
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