下列叙述中正确的是A．所有形态的二叉树都只能采用链式存储结构 B．循环队列是队列的一

根据短文内容，判断正（T）误（F）。

　　Tom works in a supermarket. The supermarket is far from his house. He

gets up very early in the morning. He usually has breakfast at half past six and

takes a bus to work. He has lunch in the supermarket. He has supper with his

family at home. After supper he usually walks along(沿着) the river with his

wife. At seven he watches TV or listen to the music .

　　Tom likes his work very much. He is always kind to others. And all his

friends love him, too. They work happily.

( ) 1. Tom is a worker in a supermarket .

(     ) 2.Tom's house isn't far from the supermarket .

(     ) 3. He doesn't have lunch with his family .

(     ) 4. He is a good worker.

(     ) 5. Few of his friends like him.

购销存子系统中，参数设置，关于“采购价取得方式”描述正确的是（）。

A.选择“零售参考价”时，单据的报价取该“物品”中的“零售参考价格”

B.选择“物品采购价”时，进货单、采购退货单中的报价取基础数据“物品”中的“采购参考单价”

C.选择“供应商价格表”时，进货单、采购退货单中的报价取供应商价格表中设置的该供应商的价格

D.选择“上次采购价”时，进货单、采购退货单中的报价分别取该物品对应的最后一次进货单和采购退货单上的价格

B787机型乘务员职责中由（）负责R3门洗手间的卫生及卫生用品的摆放和添加。

A.SS6

B.SS7

C.SS11

第(15)～(18)题基于下图所示的二叉树：在该二叉树中查找关键码值502，需要进行多少次关键码值比较 ( )

A．1

B．2

C．3

D．4

简述激光视盘机中的遥控或指令工作过程。