A musical element called a hook is often used in pop music. What is a hook? </p></p>

输入序列为ABC，可以变为CBA时，经过的栈操作为: push,pop,push,pop,push,pop|push,pop,push,push,pop,pop|push,push,pop,pop,push,pop|push,push,push,pop,pop,pop

输入序列为abc,若输出序列为bca,经过的栈操作为( ) A: push,pop,push,pop,push,pop B: push,push,push,pop,pop,pop C: push,push,pop,push,pop,pop D: push,pop,push,push,pop,pop

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 musical element called a hook is often used in pop music. What is a hook? A: .the melody of the verse B: .the melody of the chorus C: .the rhythm, which is usually on the backbeat D: .a line that is very catchy, and repeated over several times, so it is easy to remember

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; }

POP广告的主要类型包括()。 A: 吊挂式POP B: 立地式POP C: 柜台式POP D: 壁面式POP E: 手绘POP

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

POP广告的类型主要有 （ ）。 A: 店头POP B: 店内POP C: 陈列现场POP D: 店外POP