— I'm going to have my hair ____. It's too long.
A:cutting
B:to cut
C:cut
将如图所示的滑动变阻器连入电路,要求当滑动变阻器滑片P向B端移动时,接入电路中电阻变小,则滑动变阻器连入电路的接线柱应是()
如图, OC⊥OD , ∠1=50° ,则 ∠2 的度数是____