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【单选题】
气动主机遥控的加速速率限制的原则是:1额定转速30%以下加速不受限制 2额定转速30 ~ 70%实行快加速限制 3额定转速70 ~ 100%实行慢加速限制 4临界转速区内加速不受限制 5降速的限制范围与加速一样 6应急时取消负荷程序实行快加速A.
①②③④
B.
①②④⑤
C.
①②③⑥
D.
①②⑤⑥
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