最新发的初二上学期国标版寒假作业物理,数学答案,急,是最新发的答案要对,要准确率,没有数学的光发物理,有数学答案的会提高悬赏分

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最新发的初二上学期国标版寒假作业物理,数学答案,急,是最新发的答案要对,要准确率,没有数学的光发物理,有数学答案的会提高悬赏分最新发的初二上学期国标版寒假作业物理,数学答案,急,是最新发的答案要对,要

最新发的初二上学期国标版寒假作业物理,数学答案,急,是最新发的答案要对,要准确率,没有数学的光发物理,有数学答案的会提高悬赏分
最新发的初二上学期国标版寒假作业物理,数学答案,急,是最新发的
答案要对,要准确率,没有数学的光发物理,有数学答案的会提高悬赏分

最新发的初二上学期国标版寒假作业物理,数学答案,急,是最新发的答案要对,要准确率,没有数学的光发物理,有数学答案的会提高悬赏分
练一:
一:沙粒跳动,物体靠振动发声,沙粒跳动变大,振幅越大响度越大,振动,音调,空气,能量,水可以传声,音调,响度,次声波,振动,音调与生源振动的频率有关,音色,空气,传播途,人耳,生源,真空中不能传声,响度,dB,空,A,D,C,A,C,A,B,A乙,丁,甲说明真空中不能传声
二:瓶内空气柱振动产生的,空气柱越短,音调乐越高
是水使瓶内空气柱振动产生的
三:A
蜜蜂不靠翅膀振动发声
蜜蜂发声时黑点上下振动
练习2
液化 凝华
吸 熔化
高 升华 凝华
凝固 放 汽化
蒸发吸热
凝固 凝华 熔化
温室 热岛效应
压缩体积
凝华 放
蒸发 液化
蒸发吸热
液化 液化 升华 升华,凝华 凝华
ADCABD
冰 52 吸热
练习3
光 ,热 ,温度,
平面镜成像,光的直线传播
平面,虚
①③ ②⑤
CBA
漫反射 反射 光滑
4 不变
漫反射 所有
ABCBBBB
67.5度
位置 大小 不能 虚 平面镜成正立等大虚像
练习4
会聚,折射,乙,折射,虚,照相机,底片与镜头之间的距离
凹 后 ,放大,以内,虚,凸透,会聚
CADAA
底角方向偏折,会聚,凸透镜对光有会聚作用,发散,凹透镜对光有发散作用
凸透镜,三个中心不在同一高度,物距,相距,能,能
红 红光的偏折角度小
小 小 正 物距 晶状体 视网膜 ,远视眼是有于像成在视网膜前方形成的
靠近凸透镜 会聚,折射,光的折射形成的,B
练习5
mm,km,min
站台,车位,自己,运动,座位,自己,运动,静止,船,山,船,山
20,72,30S,11,46,3*10
物理的
一:
1:honest
2:secret
3:ready
4:nothing
5:humour
6:bowls
7:magazines
8:special
9:slim
10:round
二:
1:Which boy is Peter?
2:Why his legs do not fit under the school desks?
3:Betty and I may not get to see each other often.
4:The boy called Jim wants to see you
5:Do you think climbing is as exciting as skating?
三:
1—5:EDBCA
四:
1—5:BDDBD
6—10:CCBAC
五:
1—5:BABAC
6—10:BCBDC
六:
1—5:AAAAB

练习二
一:
1:geography
2:tennis
3:point
4:health
5:elevator
二:
1:is different from
2:is more boring than
3:the tallest of
4:more subjects than
三:
like classes How many library have
四:
1—5:BDDCC
6—11:BBADAC
五:
1—5:DBABC
6—10:BDBCD
六:
1—5:BBDDC:

练习三
一:
1:tidy
2:President
3:winners
4:remember
5:tickets
二:
1:Nancy went to Suzhou by train last year .
2:She like her mother and likes her mother too.
3:Linda,don't tell anyone about the matter .
4:There are more than two hundred places of interest from Beijing.
5:It is fine ,but he don't go out and stay at home.
三:
1:teachers
2:6:00 a.m
3:6:30 a.m
4:park
5:4:00
6:80
四:
1—5:CBBDB
6—10:CCBBD
五:
1—5:DACBC
6—10:BDACB
六:
1—5:DDDBB

练习四
一:
1:litter
2:metal
3:Encourage
4:calm
5:over
6:shining
二:
1:tourists
2:peaceful
3:angerly
4:importance
5:heavier
三:
1:took
2:lasts
3:is going to be
4:hurry
5:don't will fall
四:
1:join the school trip
2:feel sick
3:make a home page
4:take a underground to go to work
五:
1:What exciting news it is!
2:for the first time
3:What did the teacher tell you not to do?
4:How often do you do a bird count a year?
5:用because连用
六:
1—4:DCBD
5—8:CABD
七:
1—5:DABBA
6—10:CCDCB
八:
1—5:CCDBA

练习五
一:
1:met
2:to make
3:travels
4:paies
5:are watching
6:will finish
7:droped
二:
1:go birdwatching
2:make space for
3:have nowhere to live
4:gives me some advice
5:at a time
三:
1:different from
2:If don't
3:made of
4:won't any more
5:without help
6:rained heavily
7:because of its colourful feathers
8:endangered birds
四:
1:Jiangsu Dafeng is an idea home for Elaphurus davidianus.
2:He will arrive at 8 this morning.
3:l think running is not as exciting as driving.
4:The weather in Kunming is warm and wet aii year round.
5:We welcome visitors from around the world to Suzhou to visit.
6:I look out of the window and saw that people being rushed to remove the snow.
五:
1:telephone return
2:was wrote
3:not to make
4:playing
5:taking
6:terribly
7:moves
8:listens
六:
1:Yes.
2:Wolves
3:Humans
4:These dogs often came near humans to steal some food.
5:The dogs helped them to hunt.They could smell and hear danger before people could. They helped keep people warm on cold nights.

练习六
一:
1—5:DACCA
6—10:CACAD
11—15:DBBAB
16—20:BCCCB
二:
CGAEB
三:
1—5:ADBAD
6—10:DCBBC
四:
1—5:BABC
1—5:BACAD
英语的

语文要嘛?

只有英语。 仅供参考。练习一 一: 1:honest 2:secret 3:ready 4:nothing 5:humour 6:bowls 7:magazines 8:special 9:slim 10:round 二: