A DC servo-motor is a type of ( ) applied to automatic control systems
A: actuator
B: amplifying element
C: correcting element
D: measuring element
A: actuator
B: amplifying element
C: correcting element
D: measuring element
举一反三
- 原核生物的启动子由（） A: 核心启动子和上游控制元件（upstream control element）组成 B: -35，-10和转录起点组成 C: 由Fissite和UCE（upstream control element）组成 D: Fissite， UCE（upstream control element）以及 35，-10和转录起点等组成
- If A is a matrix, the function max(A(:)) is ( ). A: to return the first element B: to return the maximum element in each row of the matrix C: to return the maximum element in each column of the matrix D: to return the largest element of the entire matrix
- CSS中让元素隐藏，但是不清除元素的方法是（ ） A: element { display: none; } B: element { display: block;} C: element { visibility: visible; } D: element { visibility: hidden; }
- Two modules are _____ coupled if one passes an element of control to the other. A: control B: stamp C: data D: logical
- In a singly linked list which operation depends on the length of the list.( ) A: Interchange the first two elements of the list B: Delete the first element of the list C: Add an element before the first element of the list D: Delete the last element of the list