计量水、油、饮料等液体的多少,通常用______和______作单位.
计量水、油、饮料等液体的多少,通常用升和毫升作单位;
故答案为:升,毫升.
如图所示,物体用轻绳通过轻小且不计摩擦的滑轮悬挂起来,物体静止.现将B点稍向左移一点,物体仍静止,则此时与原来相比( )
A.绳子拉力变大
B.绳子拉力变小
C.两侧绳子对滑轮的合力变大
D.两侧绳子对滑轮的合力变小
Reading _______ one’s mind. You should do more reading instead of playing computer games when you are free. .
A.expands
B.arises
C.rises
D.enlarges