公钥密码是______。A) 对称密钥技术,有1个密钥 B) 不对称密钥技术,有2个

题型:单项选择题

问题:

公钥密码是______。

A) 对称密钥技术,有1个密钥
B) 不对称密钥技术,有2个密钥
C) 对称密钥技术,有2个密钥
D) 不对称密钥技术,有1个密钥

考点:计算机等级考试网络工程师计算机网络工程师
题型:单项选择题

火车运行速度较大,车轮与铁轨间的动摩擦因数较小,火车遇险紧急刹车的制动距离是很大的.据实际测定,某列火车在一直线路段车速为24m/s时,制动距离为960m.(制动距离指火车从刹车开始到停下所滑行的距离,设火车刹车时受到的阻力不变.)

(1)求紧急刹车时火车的加速度大小;

(2)若在同一路段,该列火车的行车速度提高到30m/s时,其制动距离变为多少?

题型:单项选择题

This was one of my experiences (1) . When I was in my 30s, I was working for a large international company which had its head office in London. I was working in the (2) department.

The company had a training centre which was just outside London. Different courses were held there throughout (3) and I (4) go on one training course a year. These usually started (5) a Sunday evening and lasted six days.

Once I was (6) a week’s training course with about forty (7) sales people. I was in the bar on the Friday evening and suddenly a woman who was (8) behind the bar asked mea curious question. "I hope you don’t (9) my asking," she said, "but I’ve been (10) about it all week. Have you got a sister (11) Mary" The woman’s name was June. And she used to do various jobs at the training centre. She worked in the office, she organized all the food and drink for the centre and she worked in the bar at lunchtime and in the evening.

My answer (12) June’s question was "Yes", and June said, "I thought (13) . I met her last September when she was organizing a course here. " At that time, my sister was working for (14) company but in a different part of the country. That was (15) she came to be at the training centre.

(16) surprised me was how June guessed we were brother and sister. Three things made it even more (17) . First, she had met my sister six months before she met me. Second, they have about sixty new people every week at the training centre. So about one thousand five hundred people had (18) the centre in those six months. And (19) , my sister is married, so she doesn’t have the same family name as me.

We’re not (20) , but I guess we must look quite like each other.

13().

A.that

B.it

C.such

D.so

题型:单项选择题

Dickens attacks the Utilitarian principle that rules over the English education system and destroys young hearts and minds in().

A. Hard Times

B. Great Expectations

C. Our Mutual Friend

D. Bleak House

题型:单项选择题

手太阴肺经,是十二经气血流注的起始,共有11穴。

本经逆经方向从指端由远到近向心方向依次排列的5个穴位分别是()

A.少商 鱼际 太渊 经渠 列缺

B.鱼际 少商 经渠 太渊 列缺

C.少商 鱼际 经渠 列缺 太渊

D.少商 太渊 鱼际 经渠 列缺

E.少商 鱼际 经渠 太渊 列缺

题型:单项选择题

用高锰酸钾滴定无色或浅色的还原剂溶液时,所用的指示剂为()。

A、自身指示剂

B、酸碱指示剂

C、金属指示剂

D、专属指示剂

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