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【单选题】
睾吸虫病的危害性主要是损害患者的()A.
神经系统
B.
心脏
C.
肾脏
D.
肝脏
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反馈参考答案：
举一反三
【单选题】If you have a toothache, you should ______. [ ]
A.
go to see a nurse
B.
go to see a dentist
C.
lie down and rest
D.
drink lots of water
【简答题】设连续型随机变量X的分布函数为 已知E(X)=1，则D(X)=________．
【单选题】If you go to see a doctor, the doctor will have your temperature ____ at first.A．checkB．examine
A.
298. If you go to see a doctor, the doctor will have your temperature ____ at first. A．check
B.
examine
C.
taking
D.
Taken
【简答题】已知随机变量X的分布函数为 请计算 ______, __________, __________, __________(请用分数表示,形如“b/a”)
【单选题】You go to the movieplex where movies ordinarily cost $10. You are intending to see a movie for which you have a $3 off coupon good for only that movie at that time. However, when you get there you s...
A.
The amount you value the first movie + $3.
B.
The amount you value the first movie + $10.
C.
$3.
D.
$10.
【简答题】设随机变量X的分布函数为设随机变量X服从N(μ，σ2)，试求P{｜X一μ｜＜σ}的值．已知标准正态分布函数φ(x)设随机变量X服从N(μ，σ2)，试求P{｜X一μ｜＜σ}的值．已知标准正态分布函数φ(x)的值有φ(1)=0．841 3， φ(0．5)=0．691 5， φ(2)=0．977 2．
【单选题】If you want to go to see a doctor , you'd better ______ ahead of time.
A.
make an appointment
B.
make an effort
C.
make a promise
D.
make a decision
【单选题】If you want to see stuffed fish and birds, which floor should you go to?
A.
The third floor.
B.
The fourth floor.
C.
The fifth floor.
D.
The sixth floor.
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