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【单选题】
Research Is a State of Mind For many years there has been much misunderstanding as to just what research is. The popular conception seems to be that there is something mysterious about it, and before any research can be done it is necessary to have expensive scientific apparatus and large, elaborately equipped laboratories. Actually, this is not so. (6) It is a simple, organized way of trying to accomplish something you wish to do—so simple that anyone can do research anywhere at any time. First, you select the problem you would like to solve, then you list at least ten reasons why it has not been solved. (7) It takes just as much effort to solve a useless problem as a useful one. (8) After carefully—and I want to emphasize that word “carefully”—selecting the problem and the ten things between you and the solution, you then use the same procedure as in solving a crossword puzzle.(9)In the solution of the remaining obstacles you may need some simple apparatus, but the things you will probably need most are infinite patience and persistence. Few people realize the difficulties of doing any new thing. Maybe one of the reasons people are so easily discouraged is because of their education. During all our years at school we were examined two or three times a year. If we failed once, we were out. (10)If we are going to make progress, we must learn to fail intelligently so that we won't become discouraged at the 99.9 per cent failure. 8.()
A.
Make sure the game is worth the candle.
B.
That is a step in the right direction, but I don't believe it is enough.
C.
You take the easy obstacles first and by a process of elimination you eventually arrive at the one or two major ones.
D.
But in selecting the problem, you need to be sure to analyze it carefully to see that it is worth the effort.
E.
Research isn't a physical thing at all; it's a state of mind.
F.
By contrast, all research work is 99. 9 per cent failure and, if we succeed once, we are in.
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【判断题】胡萝卜素和叶黄素最大吸收带在蓝紫光部分,也吸收红光等长光波的光。
A.
正确
B.
错误
【判断题】肺牵张反射和脑桥呼吸调整中枢共同调节着呼吸的频率和深度,切断两侧的迷走神经后,呼吸会变得深而快。
A.
正确
B.
错误
【简答题】现存唐诗的数量,今天知名的有多少人?
【简答题】胡萝卜素和叶黄素最大吸收带在蓝紫光部分,也吸收红光等长波光。(    )
【单选题】下列二输入逻辑门电路中,能实现功能 “只要有一个输入是高电平,输出就是低电平”的是:
A.
与非门。
B.
异或门。
C.
或非门。
D.
同或门。
【多选题】一般场所移动式局部照明用的电源可用( )V。
A.
36
B.
24
C.
12
D.
220
【单选题】现存唐诗的数量,今天知名的有多少人?
A.
四万八千九百多
B.
二千三百多
C.
五万多
D.
七十二
【判断题】胡萝卜素和叶黄素最大吸收带在蓝紫光部分,但它们都不能吸收红光。
A.
正确
B.
错误
【多选题】在利用逻辑门电路做具体的电路设计时
A.
与非门的多余输入端口要处理接高电平
B.
与非门的多余输入端口要处理接低电平
C.
或非门的多余输入端口要处理接高电平
D.
或非门的多余输入端口要处理接低电平
【判断题】商品盘点时要仔细检查商品质量,看商品有无受潮、发霉、干裂、鼠咬,甚至变质等情况;必要时,要进行技术检验。苫盖材料。,
A.
正确
B.
错误
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