—What's in the front of the classroom?—It's a new _1._刷题宝

题干

—What's in the front of the classroom?
—It's a new ____.

上一题下一题 0.0难度选择题更新时间:2015-01-13 05:06:12

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blackboard

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名句"众里寻她千百度。蓦然回首，那人却在灯火阑珊处"（辛弃疾《青玉案〃元夕》）中"灯火阑珊"是指（）

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Mountain Sports Center
Open Daily—9 A．M.to 9 P．M.
OPENING
SATURDAY，MAY 14
All activities and equipment(设备)in Mountain Sports Center are free to the public.
Come and enjoy：
2 Baseball Fields Walking/ Jogging Track
6 Soccer Fields Skateboard Park
4 Tennis Courts Gymnasium(健身房)
8 Basketball Courts

Opening Activities
Healthy fun for the whole family!
Free live music and healthful snacks and drinks!
◆First door prize：A bike.
◆Second door prize：A skateboard.
◆Free soccer classes for players ages 5 to 10 by Thunder coach Todd Barnett.Participants(参与者) will receive a free Thunder T-shirt.
◆Join the Mountain Summer Sports Leagues.Teams are forming for beginners (ages 8—10); teens and adults.
◆Ask Mr Jackson in the gymnasium for information on exercise and fitness classes in order to make this your healthiest summer ever.

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两个完全相同的容器中，分别盛有甲、乙两种液体，将完全相同的两个小球分别放入容器中，当两球静止时液面相平，球所处的位置如图所示，设甲、乙两种液体对容器底的压强大小分别为p_甲和p_乙，则它们的关系是（　　）

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学校买了15台同样型号的电风扇，每台的售价是105.5元，买这些电风扇一共需要多少元？

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如图所示，AB是竖直面内的四分之一圆弧形光滑轨道，下端B点与水平直轨道相切．一个小物块自A点由静止开始沿轨道下滑，已知轨道半径为R＝0.2m，小物块的质量为m＝0.1kg，小物块与水平面间的动摩擦因数μ＝0.5，g取10m/s².求：

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