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【单选题】
在采用YT-1226压力调节器的控制系统中,为提高上限压力,减小下限压力,则应 1减小输入波纹管的刚度;2左移杠杆支点;3扭松给定弹簧减小张力;4扭紧给定弹簧增大张力;5调幅差旋钮增加设定格数;6调螺钉与幅差弹簧盘间隙使之减小。
A.
②④⑥
B.
①②④
C.
①③⑤
D.
③⑤⑥
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