某闭环调速系统的调速范围是 1500 ~ 150r/min, 要求系统的静差率 s ≤ 2% ,那么系统允许的静态速降是()
A.
3.06r/min
B.
4r/min
C.
4.13r/min
D.
以上结果都不对
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
皮皮学刷刷变学霸
举一反三
【简答题】Section A So far there have been discovered no limits to man’s capacity to learn.【76】From earliest times, however, men in positions of power or influence have suggested that the learning capacity of c...
【单选题】In the earliest stages of man’s development he had no more need of money than animals have. He was content with very simple forms of shelter from natural materials around him. he made his own rough to...
A.
paper was invented
B.
nothing could be offered in exchange
C.
people practiced a simple process of exchange
D.
the exchange of one thing for another became too complicated