wasn't 和didn't怎么用

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• 用否定前缀的形容词造句1.This is a “No Parking”area.________________________________2.This chair is too small.3.___________________________________4.The boy didn’t tell the truth.__________________________________5.The restaurant is quite near here.___________________________________6.I don’t like him because he is rude._____________________________7.I have never seen such heavy snow here.___________________________________8.Water is very important to us.________
• 电容直接接在电源两端 t=0+时,电压是多少?书上说电容两端电压不能突变,那连接的瞬间,是否电路相当于短路,所以U0=0,但短路会电流,电源有内阻,是否电流等于E/R ,那么这个电流会通过电容吗?（电容是两块板,中间是介质,就是说是否有电子流过介质,如果没有,那这不是相当于开路吗?又怎么会有电流）就像我们拿一节电池,两端接导线和块板,难道就有电流了?
• You didn't put film in the camera!You didn't put film in the camera!怎么翻译?
• 高中英语填空题(bring up) (go ahead )( account for) ( by accident) ( on the contrary)( to be honest)1.Yesterday when i was wandering on the pavement near a park,i met an old neighbour ___.He was so happy to see me again and he talked a lot about my grandparents who ___me ___.____,i didn't want him to ___with his story.It wasn't because i had no___to listen to him,but because it was still very painful for me to think about my dear grandma who died five years a
• 电功电功率的题目在用电高峰时,小明和小方发现家中的灯变暗了,他们想可能是灯两端的电压变低了.为了测除灯的实际电压值,他们将家中的其他用电器都关掉,只让一盏“220V 100W”的灯工作.小明用秒表测得电能表的表盘转过n转所用的时间是t秒,算出其实际电功率（电能表表盘上标有N转/kwh的字样）.然后根据灯泡的规格,算出灯泡的电阻,最后求出两端的实际电压U1；而小方在电工的指导下用专用电表直接测出了灯两端的电压值U2.问：1.写出U1的表达式：U1= ＿ V（用已知量和直接测量量表示）2．通过分析可知；U1 ＿ U2 (填"大于""小于"或"等于"
• 1.贵州市有一批物资急需运往四川汶川地震灾区,若用n辆载重5t的汽车装运,则剩余21吨物资；若用n辆8t的汽车装运,则有(n-1)辆汽车满载,最后一辆车不空,但所载物资不足5t.（1）这一批货物共多少吨?（2）若使用载重为5t和8t的两种汽车装运,请你设计一种方案,使每辆汽车都载满,且需车辆的数量最少.
• 怎么能在x-t 和v-t图像中看出物体作直线运动?
• date和day的发音区别date day 发音区别在句子中又是怎么样的我妈说date 在句子中t的音不发?不是啊我听听力的时候有听到t不发音的句子：What's the date we will go to school again in autumn.听了n多遍,我确定它没发音啊!是练习错了,还是有这个什么东东绿眼睛的茵可,谢谢阿拉可是DATE和DAY 就只有这些区别嘛?只有t的发音区别?那个什么确定以下
• 1.You are my first good friend here.这里为什么用my而不用my the?2.My father can wear it for playing basketball.为什么用playing?3.many和much和lot of的区别.4.Let Kate come to Huaxing Clothes Store soon.为什么是come to 5.Mary needs a bag for school.为什么用for不用to?6.I'll take that pair of shoes.为什么用take不用want和need?7.这件绿色的T恤this green T-shirt为什么用this不用the?8.one和ones的用法.9.bring的对应词。
• 用所给单词的适当形式填空. 1:I usually_____to school,but yesterday I didn't______to school.(wallk)2:She______her room on Sundays,and she_____it yester,too.(clean)3:My mom is_____in the kitchen.(cook)4:It_____rainy yesterday;it____sunny now.(be) 急求啊!
• 送东阳马生序练习题说说作者在求学过程中遇到了哪些困难,他是如何克服的,他为什么能够这样么做?
• teacher's,what,English,is,name,your(连词成句）