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【单选题】
船用VHF双工工作时，收发频率差为_ _。A.
406MHz
B.
4.6 MHz
C.
25KHz
D.
50KHz
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【简答题】数据流程图的四种基本元素是：数据流、处理、（ ）和数据存储。
【简答题】8086CPU的指令队列是一组 ,用来暂时存放从存储器中取出的指令,其长度为6字节。
【简答题】数据流程图的四种基本元素是：数据流、加工处理、______和______。
【单选题】which of the following is the improper behavior when you are exchanging business card?
A.
we shouldn't present the front side of the business card to the recipient.
B.
we should stand and submit the business card with two hands.
C.
when there are many persons, we should submit the business card from near to far.
D.
when receiving the business card, we should read it carefully.