—Oh, I only need ____orange juice.
A:some;a few
B:a few;some
C:a little;few
D:a little;a few
如图甲所示,当用指甲剪剪指甲时,指甲剪可以看成是多个杠杆的组合.乙中画出剪指甲时其中一个杠杆DBE的动力臂L1和阻力F2