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單項(xiàng)選擇題

KP-2A型控制箱測量回路中（）——振蕩調(diào)節(jié)電位器，調(diào)節(jié)C1的放電時(shí)間，以改變鋸齒波電壓的波形，提高控制箱的調(diào)壓精度，消除發(fā)電機(jī)電壓振蕩。

A.Z1
B.R1
C.R2
D.R8

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