According to fibers length and orientation, the possible types of fiber-reinforced composites are ____
A、continuous and aligned
B、discontinuous and aligned
C、discontinuous and randomly oriented
D、discontinuous and particially oriented
A、continuous and aligned
B、discontinuous and aligned
C、discontinuous and randomly oriented
D、discontinuous and particially oriented
Work therefore is desirable, first and foremost, as a preventive of boredom, for the boredom that a man feels when he is doing necessary though uninteresting work is as nothing in comparison with the boredom that he feels when he has nothing to do with his days. With this advantage of work another is associated, namely that it makes holidays much more delicious when they come. Provided a man does not have to work so hard as to impair his vigor, he is likely to find far more zest in his free time than an idle man could possibly find.
The second advantage of most paid work and of some unpaid work is that it gives chances of success and opportunities for ambition. In most work success is measured by income, and while our capitalistic society continues, this is inevitable. It is only where the best work is concerned that this measure ceases to be the natural one to apply. The desire that men feel to increase their income is quite as much a desire for success as for the extra comforts that a higher income can acquire. However dull work may be, it becomes bearable if it is a means of building up a reputation, whether in the world at large or o01y in one's own circle.
What is the author's opinion about work?
A.Work can keep people busy as if they were poor.
B.Work is a cause of the greatest delight of life.
C.Work is very tiresome, especially when too excessive.
D.Work can at least give relief from boredom.
Work therefore is desirable, first and foremost, as a preventive of boredom, for the boredom that a man feels when he is doing necessary though uninteresting work is as nothing in comparison with the boredom that he feels when he has nothing to do with his days. With this advantage of work another is associated, namely that it makes holidays much more delicious when they come. Provided a man does not have to work so hard as to impair his vigor, he is likely to find far more zest in his free time than an idle man could possibly find.
The second advantage of most paid work and of some unpaid work is that it gives chances of success and opportunities for ambition. In most work success is measured by income, and while our capitalistic society continues, this is inevitable. It is only where the best work is concerned that this measure ceases to be the natural one to apply. The desire than men feel to increase their income is quite as much a desire for success as for the extra comforts that a higher income can acquire. However dull work may be, it becomes bearable if it is a means of building up a reputation, whether in the world at large or only in one's own circle.
What is the author's opinion about work?
A.Work can keep people busy as if they were poor.
B.Work is a cause of the greatest delight of life.
C.Work is very tiresome, especially when too excessive.
D.Work can at least give relief from boredom.
A、A round collar.
B、One straight piece covering the whole body.
C、Narrow sleeves.
D、Slits of two sides.
A、Using shocking statistics when necessary can make dramatic statements more effective.
B、Quotations used in introductory part should be as long as possible.
C、The props used in speech should support the objective of your speech.
D、By telling personal stories, speakers can easily involve their audience right from the start.
A、Ec=EmVm+EfVf
B、1/Ec=1/EmVm+1/EfVf
C、1/Ec=Vm/Em+Vf/Ef
D、Ec=EmVm-EfVf
A、glass fibers are very inexpensive to produce.
B、they can be used at high temperature.
C、these composites have relatively high specific strengths.
D、they are chemically inert in a wide variety of environments
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