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your shoes are under the bed you must look after ( )A.they B.their C.them D.it 英语

正方体ABCD~A1B1C1D1中E为棱CC1的中点求AC1平行平面BED 数学

如图,ABCD是正方形,PA⊥平面ABCD,且PA＝AB＝a.则二面角B－PC－D的度数为作BE⊥PC于E,连DE则由△PBC≌△PDC知∠BPE＝∠DPE从而△PBE≌△PDE∴∠DEP＝∠BEP＝90°,且BE＝DE∴∠BED为二面角B－PC－D的平面角数学

ABCD,∴PA⊥BC,又A

Kate should stay in bed for three days.（改为一般疑问句）其他

There __ a pencil and three pens in my boxa;is b;arec;will bed;is going to be 英语

正方体AC1中,E是CC1的中点,求面A1BD与面BED所成的二面角的大小请用作证算打的方法。数学

She has been in bed for a couple of days,so she has no ___to get up by herself.A.endurance B.power C.strength 并说明原因谢谢英语

This is a room in Kate’s house.There is a big bed,a table,a computer and some chairs in it.There’s a glass and some books on the table 英语

There is a pic

阅读理解 this is a room in kate's house.there阅读理解this is a room in kate's house.there is a big bed,a table,a computer and some chaies in i 英语

.there's a gla

mary has been ill in bed for a week,I wonder if she is () better now.A much B some Cany D very说明为什么英语

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