以下对非上市证券认识不正确的是( )。A．非上市证券和上市证_爱下问搜题

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问题单项选择题

以下对非上市证券认识不正确的是( )。

A．非上市证券和上市证券的划分标准为“是否在证券交易所挂牌交易”

B．非上市证券没有在证券交易所挂牌交易

C．非上市证券不可以在其他证券交易市场交易

D．凭证式国债和普通开放式基金份额属于非上市证券

答案

参考答案：C

解析： C项，非上市证券是指未在证券交易所挂牌交易的证券，但可以在其他证券交易市场发行和交易。我国在银行间市场上市的债券、凭证式国债、电子式储蓄国债、普通开放式基金份额和非上市公众公司的股票属于非上市证券。

完形填空

I had said goodbye to my husband, Joe, so often, but this time was ____.
We now had our first child. After nights of talks, we made the difficult ____ that Joe would go by himself to Alabama for the six-month training course, and I would stay behind with our new son. It was important that I ____ my teaching position near our home at Fort Hood. Also we were part of a strong network of friends ____ I could turn to for help.
On Joe's ____ evening at home, I bathed little Joey, got him into his sleeper and was heading to the bedroom when Joe gently touched ____ on the shoulder. Lifting the baby from my arms, he said he wanted to put Joey to bed tonight.
They headed down the hall, and I busied myself with meaningless tasks, ____ Joe to turn up from the bedroom within a few minutes. A half hour went by, and ____ he had not come back. Thinking he was having ____ getting our son to fall asleep, I walked quietly to the baby's room and ____ into the dimly-lit（灯光暗淡的）room.
Sitting in the rocking chair, moving slowly back and forth, was my husband with ____ in his eyes. He was holding our baby in his arms ____ he had fallen asleep long before. When his pained eyes met mine, he said, "I just can't put him down."
That night we stood over Joey's bed, holding each other and saying over and over that we would make it through this leaving and be ____ again soon.
Joey is six now, and he has a four-year-old brother named Jack. There have been many goodbyes ____ that night, yet my soldier still fights back tears when it's time to ____ once again in service to his country and give his boys that last, long hug goodbye.

B．remembering

A．even though

问答题

一个32位的计算机系统中，虚拟存储系统采用了物理地址扩展的三级分页方式，第一级页表占用地址的最高2位，第二、三级页表依次占用9位地址，最低12位用于页内偏移量，如下图所示。

一个进程的地址空间为4GB，每个页表项占用8个字节，请问：
(1)一个进程最多有多少个页面
(2)一级、二级以及三级页表各为多大一共占用多少存储空间
(3)为提高效率，一级页表和二级页表全部装入内存，三级页表只装入一页，若从OxC8000000开始顺序映射三级页表、二级页表和一级页表，请计算列出上述三组页表在内存中的地址范围。