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

单片机读内部ROM时用MOV指令，读外部ROM用MOVX指令。

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

ANB指令是（）指令，ORB是（）指令，与and、or指令不同。

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）

假定（A）=85H，（R0）=20H，（20H）=0AFH。在单片机执行寄存器间接寻址数据传送指令：“MOVA，@R0”后，累加器A的内容为（）。

OR指令的作用是: 。( )

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（）.

F1系列PLC—OR指令表示（）。