处于青春期的我们需要遵循的基本准则是( )
A:男女授受不亲
B:井水不犯河水
C:彼此独立
D:彼此尊重
Name: Macy
Age: 10
Country: Canada
Family: father, mother, brother and me
School: Garden Primary School
Favourite subjects: Music, Art
Hobbies: drawing, playing the piano
Dear Wang Li,
Thank you for your email and your photo.
I'd like to be your e-friend too.
I am from
Write soon.
Yours
Macy
_________ morning, boys and girls.
如图所示,A物体重40N,B物体重12N.A物体在绳子水平拉力作用下沿水平桌面向右做匀速直线运动,它受到桌面的摩擦力为 ____ N.如果要使A物体匀速向左运动,则应给它施加一个大小为 ____N的水平向左拉力,A向左移动0.5M则对B做了 ____J的功.