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【单选题】
已知单位反馈控制系统在斜坡函数作用下，稳态误差ess为常数，则此系统为（）。A.
0型系统
B.
Ⅰ型系统
C.
Ⅱ型系统
D.
Ⅲ型系统
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The police suspected that the fire must have broken after the workers had left the factory.
A.
off
B.
through
C.
out
D.
in
【简答题】The fire must have _____________after the staff had gone home. [A] broken down [B] broken up [C] broken out [D] broken off
【简答题】____场效应管也是一种由PN结组成的半导体器件,是电流控制器件,沟道越宽电流越大。
【简答题】The fire must have ( ) after the
staff had gone home.A. broken down B. broken through C. broken in D. broken out
【单选题】The fire must have______after the shop was closed.
A.
broken out
B.
broken down
C.
broken in
D.
broken through
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