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[单选题]
“减少缩进量”和“增加缩进量”调整的是:________。(1分)
A
悬挂缩进
B
首行缩进
C
左缩进
D
所有缩进
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试题答案:
C
答案解释:
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下列四条叙述中,有错误的一条是( )。
下列软件中属于应用软件的有( )。
一个完整的计算机系统包括______。(1分)
在IP v4中,以下地址不正确的是 ____________。
总线包括地址总线、_____总线 、控制总线三种。
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可闻及“大炮音”的疾病是( )
2.
7.与辩证唯物主义认识论相比较,旧唯物主义认识论有两个缺陷,一个是缺乏辩证法的观点,另一个是( )
3.
3. Friction is a force which opposes motion. Much of the energy supplied to a complicated machine with many moving parts is wasted in overcoming this opposition. The energy is converted into useless heat. The amount thus lost can be considerably reduced and the life of the machine prolonged by careful lubrication. This reduction improves the efficiency of the machine. Another way in which friction is reduced is to substitute roller or ball bearings for the earlier type of bearing, in which the surfaces in contact move by sliding. Bearings of these later types are used very extensively in many kinds of modern machinery.It must not be assumed, however, that friction is always a disadvantage. In many instances it is highly important. Belts are often used in conveying power from one machine to another. In the absence of friction, this could not be done. The driving wheel would not run the belt, neither would the belt run the wheel to driver. Without friction, then, belted machinery could not be used. Again in the case of all motor vehicles, friction is essential in the operation of the brake. Were there no friction, there could be no brake. But even this illustration does not give an adequate picture of the importance of friction. The vehicle could not even be started if it were not for the friction exerted between the tires and the road. Nails hold in wood, and screws hold in either wood or metal by reason of friction, without which they would be useless. Walking is difficult enough on an icy pavement, but it would be wholly impossible if there were no friction at all between the shoe and the pavement.(5分)3.1 Friction arises when____.(1分)A. an opposing force of motion exists B. the energy is wastedC. everything is motionlessD. a complicated machine is supplied with energy
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对放射疗法中度敏感的肿瘤是(?)
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磁盘格式化操作具有( )等功能。
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