交流接触器为什么不能作为直流接触器使用？

A young mother thought that it was very wrong to waste any food when there were so many hungry people in the world. One evening, she was giving her small daughter her tea before putting her to bed. First she gave her a piece of bread and butter, but the child said that she did not want it like that. She asked for some jam on her bread as well.

Her mother looked at her for a few seconds and then said, “When I was a small girl like you. I was always given either bread and butter, or bread and jam, but never bread with butter and jam.”

Lucy looked at her mother for a few moments with pity in her eyes and said to her kindly, “Aren’t you pleased to live a happy life this now?”

小题1:Lucy’s mother thought it was wrong to waste food because            .

A．the food was delicious

B．it was hard to get food

C．there were so many hungry people in the world

D．the food was little to eat小题2:Lucy wanted to eat           .

A．tea and bread

B．the bread with butter

C．the bread with jam

D．the bread with butter and jam小题3:When she was young, Lucy’s mother could only eat            .

A．both bread with butter and bread with jam

B．either bread and butter or bread and jam

C．bread and butter

D．bread and jam小题4:Lucy felt           about this at her mother’s words.

A．very sad

B．sorry

C．pity

D．worried小题5:Lucy thought her mother should feel happy because          .

A．she had come to live today’s happy life

B．they needn’t eat bread with butter and jam

C．they could eat bread and butter

D．they couldn’t eat bread with butter and jam

在电子邮箱系统中，通讯录的功能是（）

A.保存邮件

B.保存联系人的地址

C.保存垃圾邮件

D.保存新邮件

出口卖方信贷报审材料除了常规的送审材料外，还需要包括( )。

A．出口方银行与进口商或进口商的银行签订的信贷协议

B．出口许可证或其他证明文件

C．商务合同

D．借款人具有机电产品出口经营权的证明文件

E．出口企业与进口商签订的贸易合同

脾病及肾属于()
肺病及心属于()

A.相乘

B.相侮

C.相克

D.母病及子

E.子病犯母

算法的复杂度主要包括时间复杂度和______ 复杂度。