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【单选题】
欲比较某地成年男子的舒张压和收缩压的变异程度大小,应采用的指标是()A.
标准差
B.
方差
C.
极差
D.
变异系数
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反馈参考答案：
举一反三
【单选题】There is a 10minute parking ________ here, so we must get back to the car very quickly. [ ]
A.
freedom
B.
limit
C.
permission
D.
ability
【单选题】There is a 20 minute parking _____ here, so we must get back to the car very quickly.
A.
freedom
B.
limit
C.
allowance
D.
prohibition
【简答题】A．should get a parking ticket first B．should not leave your car there too long C．must wait until after 5:30 D．will nm the risk of being fined
【简答题】We must get the car ________________ (repair).
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