从梯形图的结构而言,常开或常闭触点是线圈的工作条件,线圈的动作是触点运算的结果。
A. 对
B. 错
在同一程序中不能使用双线圈输出。
A. 对
B. 错
Who among the following is an English dramatist?
A. William Shakespeare
B. Charles Dickens
C. Walt Whitman
D. Thomas Hardy
It is assumed that the internet is an efficient____ of communication.
A. means
B. meaning
C. meaningness
D. mean