S7系列PLC的状态字(STW)的()位与指令框的使能输出ENO的状态相同。
查看答案
Which of the following statements is least likely to cause the ignition of fuel vapors?()
A. Static electricity
B. An open running electric motor
C. Loose wiring
D. Explosion proof light
国内发行量最大的刊物《读者》曾转载了一篇科幻小说,它的名字是什么?
第二次世界大战前较系统的建立起公司识别的大公司之一是意大利的()。
A vessel is considered to be “restricted in her ability to maneuver” under the Rules if she is ().
A. at anchor
B. mineclearing
C. engaged in fishing
D. engaged in towing