儿童泳池在开放期间保持水()。
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某广告说用气功疗法在3个月内治疗了1000例高血压病人,其中950例痊愈,治愈率达95%。下列哪个结论正确()
A.气功疗法降压效果好,观察3个月95%病人有效
B.因样本不大,故无法下结论
C.此法效果可疑,因观察时间不长,5%未显效
D.无法作出结论,因未设对照组
E.无法作出结论,因未作统计学检验
短文填空 (共10分,每空1分)
Early in the morning, Mr. Black was carrying a big basket of cabbages to the market. She hoped 小题1:___them to the people from town. The mountain road was narrow(狭窄的)and the old woman 小题2:___carefully. Suddenly she 小题3:___a loud bell. It passed her and very fast down the hill. The old woman had to 小题4:__to one side of the road so quickly that the basket of cabbages nearly 小题5:___into the valley. She saw a young boy 小题6:.___on the bicycle without even 小题7:___round to see if the old woman was all right. The old woman shouted, 小题8:___back.” “What 小题9:___it?” the boy asked impolitely, pushing his bike towards the old woman. “What did I drop?” “Little boy, you 小题10:___your manner.” The old woman answered. |
用氢气还原氧化铜,要得到6.4 g铜,需要多少克氧化铜?
KM型压滤机液压油()更换一次,以延长阀组寿命。
A、一个月
B、一个季度
C、半年
D、一年
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