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明朝后期为什么实行海禁历史上郑和为什么只有七次下西洋,而没有第八次? 为什么明朝实行海禁,还有贸易出现? they study English 2.my sister goes to bed early 3.Wendy and ,i have a pet 改为否定句和一般疑问句 用极坐标系方法求解.过定点P（1,1）的直线与圆x^2+y^2=4交于A、B两点,求PA乘以PB的值为多少? Do you think everything is done by a computer?I don't think so.请问这二句话正确吗? i don't think homes will have computer.i don't think there will be any 请你用 I don't remember 和 I can't remember 各造两句话短句. Can you take my rlands中文是什么意思 明朝为什么会有海禁的政策? 单句改错：l think she also have a computer l think it's interesting to write computer p____ hans是什么意思? 关于Skylar Grey和Love the way you lie&I need a doctor的关系Skylar Grey是否参加了制作? The kids in poor areas need clothes_______(最大). love I do not need the kind of 有助于回答者给出准确的答案 hans j vermeer是什么意思 明朝为什么实行“海禁”?看书上说,是担心流亡海上到敌对势力勾结倭寇,危机明朝的统治.想问下这个敌对势力是谁?我看书,了解到朱元璋死后王位本来是传给他大儿子的,可惜早死,就传给他 已知三条直线两两相交于a,b,c三点,第四条直线bf交直线ab于d,交直线bc于e,交直线ac于f,问共产生几条线段?并根据题意画出图形. 若A={1/2 直线a、b交于O点,∠1=∠2,∠3:∠1=8:1求∠4的度数∠4=∠1＋∠2这是图 We are thinging of makinga computer"think"like a man.of making 1.I think it's b__ yo play computer games all day. 2.Mary is a__ to cross the river on a ropeway.3.We all enjoy the t___ to Hainan.It's great. 4.It isn't my first time to visit Wuhan.I don't need ____(buy) a map of the city.5.Can you tell me some way 六级作文 comment on man and computer 我写了some people think……others think 最后一段写自己的观点这么写 算偏题吗标题是 man and computer 但要求文章comment on一句话如果算偏题 那么分数会不会很低啊T T as much time+v-ing as 后加什么?The boy spends at least as much time reading as he___.A.writes B.is writing C.does to write D.does writing Is there such a person,you want to give up many times said,but ultimately or loathe to give up 是快 The things you need to do is to read and listen more对吗?如上,需要在listen前面加to吗回2楼，不过我说的是在listen前面，不是后面～呵呵～ hans is here hoG | Hans 如图：⊙O的两条弦AB、CD相交于AB的中点E,且AB=4,DE=CE+3,则CD的长为多少? 如图,已知⊙O的两条弦AB、CD相交于AB的中点E,且AB=4,DE=CE+3,则CD的长为多少 如图,AB、CD交于E,∠A+∠B=180,求证：CE=DE(三种不同方法）