A:However life is difficult
B: However is life difficult
C:However difficult life i
D: However difficult is life
某同学在实验室做了如图所示的实验,铁质小球被电磁铁吸附,断开电磁铁的电源,小球自由下落,已知小球的直径为0.5cm,该同学从计时器上读出小球通过光电门的时间为1.00×10﹣3 s,g取10m/s2,则小球开始下落的位置距光电门的距离为( )
如图,矩形OABC的顶点O是坐标原点,边OA在x轴上,边OC在y轴上.若矩形OA1B1C1与矩形OABC关于点O位似,且矩形OA1B1C1的面积等于矩形OABC面积的14,则点B1的坐标是( )
一个人出现水肿,其原因可能是( )