下列单位换算中正确的是:( )
A:26cm=26cm×0.01m=0.26m
B:10km=10×1000m=104m
C:5min=50s
D:1km/h=3.6m/s
西瓜是解暑的佳品,西瓜果实中含有许多粒种子,这是因为花的结构中含有多个( )
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如图,在平面直角坐标系中,O为原点,平行四边形ABCD的边BC在x轴上,D点在y轴上,C点坐标为(2,0),BC=6,∠BCD=60°,点E是AB上一点,AE=3EB,⊙P过D,O,C三点,抛物线y=ax2+bx+c过点D,B,C三点.
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