单回路控制系统是指怎样一种系统?
参考答案:
在一个被控对象上采用一个调节器来保持一个变量(或称参数)恒定,而调节器只接受一个测量信号,其输出只控制一个执行器(或称调节器)。
0n a vesel proceeding from a very cold to a warm climate with a cargo of a nonhygroscopic nature in the holds, which is true?().
A.Danger of heavy ship sweat exists; constant and vigorous ventilation is required
B.There is danger of heavy cargo sweat if outside air is introduced by ventilation
C.There is little danger of ships sweat, slight possibility of cargo sweat; moderate ventilation is needed
D.The po sibility of any sweat problem, either cargo or ship, is frame
坏死后性肝硬化()
A.假小叶均较小,纤维间隔较薄,炎细胞浸润较轻
B.假小叶大小不等,纤维间隔较厚,炎细胞浸润较重
C.肝细胞大片崩解坏死,肝细胞再生不明显,炎细胞浸润
D.肝细胞大片崩解坏死,肝细胞再生结节,纤维组织增生