What does the father mean?
A:He wants his daughter to stay at home.
B:He will offer any help to his daughter.
C:He will give the talk for his daughter.
PM2.5是指大气中直径小于或等于2.5____ (填长度单位)的颗粒物,也称之为可入肺颗粒物.一张纸的厚度约75μm=____ m.
— ________ Maria from Japan? — Yes, ________.
如图所示,ad、bd、cd是竖直面内三根固定的光滑细杆,a、b、c、d位于同一圆周上,a点为圆周的最高点,d点为最低点.每根杆上都套着一个小滑环(图中未画出),三个滑环分别从a、b、c处释放(初速为0),用t1、t2、t3依次表示滑环到达d所用的时间,则( )