系统中雷达状态包括Unknown、Operational（or ON）、Failed（or OFF）、Detached。

设a=2，b=3，c=4，d=5，下列表达式的值是（ ）。 3>2*b Or a=c And bc Or ba+c

设a=′′a′′，b=′′b′′，c=′′c′′，d=′′d′′，执行语句x=IIf（（ad），′′A′′，′′B′′）后，x的值为（　　）。

运用存货ABC分析法管理存货时，应重点控制的存货是（）

运用存货ABC分析法管理存货时，应重点控制的存货是（）。

Project（71）is an uncertain event or condition that，if it occurs，has a positive or a negative effect on at least one project objective，such as time，cost，scope，or quality．

● Project（71）is an uncertain event or condition that, if it occurs, has a positive or a negative effect on at least one project objective, such as time, cost, scope, or quality.（71）

输出继电器（OR）通过一对（）触点将PLC的控制信号传递给负载。

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

A mark or place at which a vessel comes under obligatory entry，transit，or escort procedure is know as（）.

表达式(8+3＞36.OR..T..AND.“A”-“B”$“ABC”)的运算顺序是______。

FX2N 系列可编程序控制器输入常开点用( )指令。 A、LD B、LDI C、OR D、ORI