Getting older No one really knows how and why people change as they get older. Also, no theory sufficiently explains all the changes of the aging process. Aging is a complex and varied process that
将直角边长为3cm的等腰直角△ABC绕点A逆时针旋转15°后,得到△ADE,则图中阴影部分的面积为 ▲ cm2
66. I need cloth, for I’m going to make clothes. A. a lot of…many B. much…much C. many…many D. many…a lot of
膳食纤维成了人体“第七类营养素”是因为它能为人体提供能量...... ......( )
在图所示的电路中,电阻R1的阻值为10欧。闭合电键S,电流表A1的示数为0.6安,电流表A2的示数为0.3安。求:① 电源电压。② 电阻R2消耗的电功率。
升高温度能加快反应速率的主要原因是( )A.活化分子能量明显增加 B.降低活化分子的能量C.增大了活化分子百分数
已知x、y之间的数据如下表所示,则y与x之间的线性回归方程过点x0.10.20.30.5y2.112.854.0810.15A.(0.1,2.11) B.(0.3,4.08)C.(