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• 已知A、B、C三点不共线，M、A、B、C四点共面，则对平面ABC外的任一点O，有OM＝12OA+13OB+tOC，则t=______．
• 英语选择题13题1.it is often less expensive to buy goods _____a.in huge quantities b.a lot c.in quality d.ad most2.he rushed off,even _____ to take his overcoat.a.forgets b.forgetting c.forgotten d.having forgotten3.the Hubble telescope _____ into space in 1990 was faulty from the start.a.launching b.launched c.to launch d.having launched4.the forest fire _____ put out earlier.But in fact it took the firemen three months to put it out.a.needn't have been b.o
• 从双曲线x2a2-y2b2=1（a＞0，b＞0）的左焦点F引圆x2+y2=a2的切线，切点为T，延长FT交双曲线右支于P点，若M为线段FP的中点，O为坐标原点，则|MO|-|MT|与b-a的关系为（　　）A. |MO|-|MT|＞b-aB. |MO|-|MT|＜b-aC. |MO|-|MT|=b-aD. |MO|-|MT|与b-a无关
• 如图,在平行四边形ABCD中,对角线AC,BD相交于点O,若E,F是AC上两动点,分别从A,C两点以相同的速度向C、A运动,其速度为1cm/s（1） 当 E与F不重合时 四边形DEBF是平行四边形吗?理由?（2）若BD=12Cm Ac 16CM 当运动时间t为何值时 以D、E、B、F为顶点的四边形是矩形?（好的给50分!）如图：
• melts in your mouth,not in your
• 1.____________ pen is that?Linda's.2.____________ is the girl?Linda.3.____________ is the cat?White.4.____________ are the the buses?In front of the school building.5.____________ pictures are there on the wall?Four.6.____________ is Tom?He's a pupil.7.____________ are these?Red apples.8.____________ do you have lunch?At twelve o'clock.9.____________ are you late,boy?My alarm clock doesn't work.10.___________ did you go to school?By bus.11.___________
• 1,做匀加速运动的列车出站时,车头经过站台某点O时速度是1m/s,车尾经过点O时速度是7m/s,则这列列车的中点经过O点时速度为（）2,火车的速度为8m/s,关闭发动机后前进70m时速度减为6m/s,若再经过50s,火车又前进的距离为（）（我的思路：根据题意得,求得a=-0.2m/s^2,根据运动规律,s=V0×t+1/2at^2,求得s=50m）请写出具体的解题过程
• melt in your mouth ,not in your
• 英语翻译5．As there is no direct Vessel sailing for your port this mouth,please amend your L/C NO.543 to allow transshipment,instead of “transshipment not allowed” as laid down in the L/C .We must have the amendment in the first half of the month as otherwise we shall be unable to effect shipment ,and an extension of one month for the time of shipment and negotiation will be necessary.
• At ___ ten o'clock,she didn't feel ____.A about ,good B around ,good C about,sick D around ,wel怎么填
• back tongue
• wave one's tongue 是啥意思啊?