监理机构对承包人检验结果的跟踪检测的检测数量，混凝土试样不应_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

监理机构对承包人检验结果的跟踪检测的检测数量，混凝土试样不应少于承包人检测数量的（）。

A.6%

B.7%

C.8%

D.10%

答案

参考答案：B

阅读理解

City	Min (⁰C)	Max (⁰C)	Weather	City	Min (⁰C)	Max (⁰C)	Weather
Beijing	24	31	cloudy	Paris	15	29	clear
London	13	27	cloudy	Singapore	27	30	Thunder shower
Moscow	11	22	cloudy	Sydney	13	19	windy
New York	22	26	cloudy	Tokyo	23	27	rainy

小题1:Which city was the hottest on that day?

小题2:How many kinds of weather were on the form?

小题3:Can you guess what ‘min’ means and ‘max’ means?

A．‘min’ means the smallest number and ‘max’ means the biggest number.

B．‘min’ means the biggest number and ‘max’ means the smallest number.

C．‘min’ means the temperature in the day and ‘max’ means the temperature at night.

D．‘min’ means the temperature at night and ‘max’ means the temperature in the day.

小题4:How many continents are the cities in ?

小题5:It is in winter in ____________.

问答题

如图所示为两组平行金属板，一组竖直放置，一组水平放置，今有一质量为m的电子静止在竖直放置的平行金属板的A点，经电压U₀，加速后通过B点进入两板间距为d、电压为U的水平放置的平行金属板间，若电子从两块水平平行板的正中间射入，且最后电子刚好能从右侧的两块平行金属板穿出，已知电子电量为e，求：

（1）电子通过B点时的速度大小；

（2）水平放置平行金属板的长度．