下面关于RS-232标准的叙述中,错误的是:A.PC机串行接口的电气规范与USB标准

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问题:

下面关于RS-232标准的叙述中,错误的是:

A.PC机串行接口的电气规范与USB标准的电气规范一致

B.RS-232标准采用负逻辑,即逻辑1电平为-5V~-15V;逻辑0电平为+5V~+15V

C.RS-232标准的逻辑电平与TTL/CMOS逻辑电平不兼容

D.数据终端设备DTE和数据通信设备DCE采用RS-232标准时,它们的引脚具有相同的名称,但同名引脚的信号流向相反

考点:计算机等级考试PC技术全国计算机等级考试三级PC技术真题2003年9月
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Most "unassertive" people are not confident and take no for an answer much too easily. There is a growing awareness in our society that this tendency (1) the rights of large numbers of people. For example, in recent years there has been an upsurge in (2) and pressure groups. This is a (3) as there will always be a need for such organizations to (4) individuals and minorities in a competitive society. The danger is that we (5) for our rights and lose the art of asserting ourselves. It is better for (6) with other people if you can learn (7) for yourself.
Now, we have to learn to ignore some of the (8) that may be ringing in our unconscious minds, such as: "If you ask once more, I’ll flatten you", and " (9) ".
The main technique that we use in (10) to practice the art of persistence is called Broken Record. (11) we hear one sentence over and over again until we reach screaming pitch and (12) .
Broken Record is the skill of being able to repeat over and over again, (13) , what it is you want or need, until the other person gives in or (14) .
Now, this technique is extremely useful for dealing with situations where your rights are clearly (15) , or coping with situations where you are likely to be diverted by clever, (16) .
The beauty of using Broken Record is that you (17) because you know exactly what you are going to say, however (18) the other person tries to be.
As with most assertive techniques, it must be used appropriately. It is (19) and is not designed to foster deep, interesting conversations and friendships with people! It is primarily of use in situations where (20) .

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甲公司对外币业务采用交易发生日的即期汇率折算,按月计算汇兑损益。2012年3月20日,该公司自银行购入400万美元,银行当日的美元买入价为1美元=7.20元人民币,美元卖出价为1美元=7.24元人民币,当日市场汇率为1美元=7.22元人民币。2012年3月31日的市场汇率为1美元=7.23元人民币。2012年3月甲公司购入的200万美元所产生的汇兑损失为()万元人民币。

A.2 

B.6 

C.0 

D.4

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肠热下利证大便及腹部的特点是()

A.腹胀满,便溏臭不爽

B.下利色黄热臭,腹不硬痛

C.便秘或纯利恶臭稀水,硬满硬痛

D.脘腹胀满,大便稀溏

E.少腹坚满,大便色黑易下

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侧踢腿的易犯错误有哪些?如何纠正?

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高级防护实验室属于下列几级生物安全水平:()

A.四级

B.三级

C.二级

D.一级

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