题目

如图所示，T为理想变压器，A1、A2为交流电流表，R1、R2为定值电阻，R3为滑动变阻器，原线圈两端接恒压交流电源，当滑动变阻器的滑动触头向下滑动时 A.A1读数变大，A2读数变大                   B.A1读数变大，A2读数变小C.A1读数变小，A2读数变大                   D.A1读数变小，A2读数变小I have bought a cup him. You don’t have to provide him bottled water. After all, plastic is harmful to the environment.A. to; with B. for; for C. to; to D. for; with