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- 1They have some problems geting there They have some problems to get there 哪句才是对的?
- 2playing in the water___lots of fun.A.is B.has应该选哪个
- 3用石墨电极电解84.75mL的NaOH溶液 经过一段时间后电解质溶液浓度为19.5%
- 4计算:108°18′-56°23′=_.
- 5They have two English lessons in the morning 对 two English 提问
- 67和8是56的因数,56是7和8的倍数,
- 78.4g N2与9.6g某单质Rx,所含原子个数相同,且分子数之比为3:2,则R的相对原子质量是_,x值为_.
- 8已知等差数列{an}的前n项和Sn=n²求an
- 91.一次函数y=3x+b的图像与两坐标轴围城的三角形面积是24,球b.2.y=(3/2)x-3与x y交点?围成三角形的面积
- 10如图,已知:△ABC为等边三角形,延长BC到D,延长BA到E,使AE=BD,连结EC、ED,试说明CE=DE.