【单选题】有关WindowsXP的“资源管理器”,下面叙述错误的是( )。
【单选题】Many people in big cities complain of the fast______of modern life.
【简答题】[程序] START PRUGBC LD GR0,DATA LEA GR1,0 LEA GR3,48 LOOP1 CPL GR0,WDT,GR1 JP2 LOOP2 ST GR3,BTASC,GR1 LEA GR1,1,GR1 LEA GR2,-4,GR1 JN2 LOOP1 (1) LOOP2 LEA GR2,48 LOOP3 CPL GR0,WDT,GR1 JMI NEXT (2) LEA G...
【简答题】The weather predictions for Asia in 2050 read like a story from a doomsday movie. Many experts and green groups fear they will come true unless there is a united global effort to hold back greenhouse ...
【单选题】下列关于可编程控制器的特点描述不正确的是( )。
【单选题】可编程序控制器的特点是
A.
不需要大量的活动部件和电子元件,接线大大减少,维修简单,维修时间缩短,性能可靠
C.
数字运算、计时编程简单,操作方便,维修容易,不易发生操作失误