问题 问答题

探究金属螺帽(直径小于2cm),可能是铜、铁或铝制成.请制定一个测定金属螺帽密度的实验计划.(题型一、题型二)

(1)除被测的金属螺帽外,还需要选用的实验器材是:天平、量筒、水

(2)需要进行的实验操作步骤是:

①用天平测出金属帽的质量m;

②量筒中装入适量水,读出水的体积V1

③将金属块放入量筒浸没水中,读出螺帽和水的总体积V2

(3)金属螺帽密度的表达式:ρ=______.

答案

用天平测出金属螺帽质量m,在量筒中倒入适量水,读出体积为V1,将螺帽浸没在量筒的水中,读出体积为V2,螺帽体积V=V2

(1)天平、量筒、水.

(2) ①用天平测出金属螺帽的质量m

②量筒中装入适量水,读出水的体积V1

③将螺帽放入量筒中的水中,读出螺帽和水的总体积V2

(3) ρ=

m
V2-V1

阅读理解

Vancouver ended its time hosting the 2010 Olympic games on a light-hearted note, with a closing ceremony that featured floating moose, dancing Mounties and gigantic cut-out hockey players wearing the gold medals Team Canada had won hours before.

The upbeat ending was in stark contrast to the grim beginning of these games, which were marred by protests, the death of a Georgian luger, and then by unseasonably warm weather that left organizers postponing events and trucking in snow on Cypress Mountain.

``You took on a stubborn mountain with all your might,'' said Vancouver Organizing Committee CEO John Furlong, lauding the games' blue-garbed staff in a speech during the ceremony. ``The final result: Blue Jackets 1; Cypress Mountain weather zero.''

During the closing ceremony, Vancouver passed the baton to Sochi, Russia, which will host the 2014 winter games.

68. Which one didn’t happen at the beginning of games?

A. snow once was a big problem for the events.   B. a Georgian coach died

C.weather became warm out of season.        D. something unharmonious happened.

69. According to Furlong’s speech, we can infer that _________.

A.you made every effort to climb up the mountain

B.Cypress Mountain is quite stubborn.    C.mountain weather was up to zero cold.

D.to some degree, blue-grabed staff are supernatural.

70. What happened at the closing ceremony?

A.Team Canada won the first place in hockey.      B.A handover ceremony ocurred.

C.Furlong announced the final result in the last event.

D.Some staff trucked snow to the scene.

71. The best title is ______________.

A.Vancouver Ends 2010 Games With A Smile   B.Team Canada Achieved A Great Success.

C.A Splendid Closing Ceremony              D.The Wonderful 2010 Winter Games

选择题