下列滤器中能用于分子分离的是哪种
A．砂滤棒
B．垂熔玻璃滤器
C．超滤膜
D．微孔滤膜
E．板框滤器
参考答案：C
This sweater fits me, but I can’t afford to buy __． I have to choose __ that is cheap enough for me．
A．one; that
B．that; it
C．it; one
D．that; the one
度游标尺是用来测量工件的梯形孔、盲孔、凹槽等深度的量具。
