小明在“观察水的沸腾”实验中,当温度达到90℃时,每隔1min记录一次水的温度,

题型:实验题

问题:

小明在“观察水的沸腾”实验中,当温度达到90℃时,每隔1min记录一次水的温度,直到水沸腾后,又经过了5min,得到的温度数据填在下面的表格里:

(1)请在下图中画出水沸腾时温度随时间变化的图象。

(2)从沸腾的图象中可以看出,水沸腾时的温度是___________℃。

(3)从实验记录的数据中可以发现,第_________min的数据记录是错误的,你的依据是__________________。你觉得产生这种错误的原因可能是__________________。

(4)为什么小明测得的水沸腾时的温度不是100℃呢?

考点:沸腾及沸腾的特点沸点与大气压的关系
题型:实验题

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Larry Page and Sergey Brin met in 1995,  小题3: they were both studying computer science at a university. They dreamed of producing something that could answer  小题4: questions in seconds. They decided to make a better and faster search engine(搜索引擎)  45  January 1996. At that time  小题5: would give them money for their project, so they had to borrow money from family and friends. Soon they started their own company. Its name Google comes from math. A ‘google’ is 小题6: very high number —1 followed by a hundred zeros.

The google search engine was soon used by thousands of people worldwide  小题7: it was fast, easy and correct. By 2002 it became the  小题8: (big) search engine on the Internet. Google hopes that in the future all the world’s information 小题9: be put on the Internet, so that everybody can find everything.

题型:实验题

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A、血染卢沟桥

B、平型关大捷

C、血战台儿庄

D、百团大战

题型:实验题

佛教四大天王中的西方广目天王手持的法器是( )。

A.琵琶
B.宝剑
C.宝伞
D.宝珠、龙

题型:实验题

在中碳钢上攻M10X1.5螺孔,其底孔直径应是()。

A、10mm

B、9mm

C、8.5mm

D、7mm

题型:实验题

在水平均质具有潜水自由面的含水层中进行单孔抽水试验,如图所示,已知水井半径r=0.15m,影响半径R=60m,含水层厚度H=10m,水位降深S=3.0m,渗透系数K=25m/d,流量最接近()。

A.流量为572m3/d

B.流量为669m3/d

C.流量为737m3/d

D.流量为953m3/d

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