The doctor advised her to eat more bean products________meat which might be harmful to her heart.
A:for lack of
B:by means of
C:in place of
D:in favour of
物理实验中经常用到的滑动变阻器。将它连入电路,移动滑片可以改变连入电路中的电阻值,变阻器是通过改变电阻丝的____ 来改变电阻的大小。