可编程控制器的输入、输出,辅助继电器,计时、计数的触点是()无限地重复使用。
A.无限的,能
B.有限的,能
C.无限的,不能
D.有限的,不能
参考答案:A
如果排气管或消音器堵塞而排气不畅,会引起()。
A、水箱水温过高
B、飞车
C、发动机转动无力
D、自动熄火
Which of the following is NOT true of meditation a. It relieves the pain of cancer. b. It counteracts the effect of depression. c. It has mystic elements. d. It has long been used as a cure-all.