最新發的初二上學期國標版寒假作業物理,數學答案,急,是最新發的

題目:

最新發的初二上學期國標版寒假作業物理,數學答案,急,是最新發的
答案要對,要準確率,沒有數學的光發物理,有數學答案的會提高懸賞分

解答:

練一:
一:沙粒跳動,物體靠振動發聲,沙粒跳動變大,振幅越大響度越大,振動,音調,空氣,能量,水可以傳聲,音調,響度,次聲波,振動,音調與生源振動的頻率有關,音色,空氣,傳播途,人耳,生源,真空中不能傳聲,響度,dB,空,A,D,C,A,C,A,B,A乙,丁,甲說明真空中不能傳聲
二:瓶內空氣柱振動產生的,空氣柱越短,音調樂越高
是水使瓶內空氣柱振動產生的
三:A
蜜蜂不靠翅膀振動發聲
蜜蜂發聲時黑點上下振動
練習2
液化 凝華
吸 熔化
高 升華 凝華
凝固 放 汽化
蒸發吸熱
凝固 凝華 熔化
溫室 熱島效應
壓縮體積
凝華 放
蒸發 液化
蒸發吸熱
液化 液化 升華 升華,凝華 凝華
ADCABD
冰 52 吸熱
練習3
光 ,熱 ,溫度,
平面鏡成像,光的直線傳播
平面,虛
①③ ②⑤
CBA
漫反射 反射 光滑
4 不變
漫反射 所有
ABCBBBB
67.5度
位置 大小 不能 虛 平面鏡成正立等大虛像
練習4
會聚,折射,乙,折射,虛,照相機,底片與鏡頭之間的距離
凹 後 ,放大,以內,虛,凸透,會聚
CADAA
底角方向偏折,會聚,凸透鏡對光有會聚作用,發散,凹透鏡對光有發散作用
凸透鏡,三個中心不在同一高度,物距,相距,能,能
紅 紅光的偏折角度小
小 小 正 物距 晶狀體 視網膜 ,遠視眼是有於像成在視網膜前方形成的
靠近凸透鏡 會聚,折射,光的折射形成的,B
練習5
mm,km,min
站台,車位,自己,運動,座位,自己,運動,靜止,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

練習二
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:

練習三
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

練習四
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連用
六:
1—4:DCBD
5—8:CABD
七:
1—5:DABBA
6—10:CCDCB
八:
1—5:CCDBA

練習五
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.

練習六
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
英語的

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