6135型柴油机的排气门间隙为()mm。A、0.25 B、0.30 C、0.35 D

题型:单项选择题

问题:

6135型柴油机的排气门间隙为()mm。

A、0.25

B、0.30

C、0.35

D、0.40

考点:作业机司机考试作业机司机考试题库
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计算题:已知加热炉的满负荷运行时的鼓风量是113000Nm3/h,理论上需要的风量是75333Nm3/h,求此时的空气过剩系数。

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已知函数f(x)=sin x+tan x,项数为27的等差数列{an}满足an∈(-
π
2
π
2
),且公差d≠0,若f(a1)+f(a2)+…f(a27)=0,则当k=______时,f(ak)=0.
题型:单项选择题

小明和小红利用如图所示的装置探究“导体产生的热量与电阻大小的关系”。质量相等的两瓶煤油中都浸泡着一段金属丝,甲烧瓶中的金属丝是镍铬合金丝,电阻比较大。乙烧瓶中的金属丝是铜丝,电阻比较小。

(1)实验中用到的测量仪器除温度计外,还需要______________________________。

(2)实验前,小红问小明“水比较容易获得,干嘛不用水代替煤油”。对于这个问题,你认为合理的解释是:________________________________________。

(3)实验中,小明和小红发现__________烧瓶中温度计的示数升高快。这表明:在电流和通电时间相同的情况下,导体的电阻越____________________,产生的热量越多。

(4)最后,小明和小红又利用此装置,添加了必要的器材,探究了“通电导体产生热量的多少和电流的关系”,他们控制通电时间相等,调节滑动变阻器改变__________,观测其中一根电阻丝所在煤油温度的变化,从而得出结论。

(5)小明提议利用该装置改成“比较水和煤油比热容的大小”的实验。则他们应如何替换上述实验中的器材?请你写出具体的替换方案。(2分)

题型:单项选择题

斗轮机冬季操作有哪些要求?

题型:单项选择题

In order to understand, however imperfectly, what is meant by "face", we must take (1) of the fact that, as a race, the Chinese have a ply (2) instinct. The theatre may almost be said to be the only national amusement, and the Chinese have for theatricals a (3) like that of the Englishman (4) athletics, or the Spaniard for bull-fights. Upon very slight provocation, any Chinese regards himself in the (5) of an actor in a drama. He throws himself into theatrical attitudes, performs the salaam, falls upon his knees, prostrates himself and strikes his head upon the earth, (6) circumstances which to an Occidental seem to make such actions superfluous, (7) to say ridiculous. A Chinese thinks in theatrical terms. When roused in self-defense he addresses two or three persons as if they were a multitude. He exclaims: "I say this in the presence of You, and You, and You, who are all here present. " If his troubles are adjusted he (8) of himself as having "got off the stage" with credit, and if they are not adjusted he finds no way to "retire from the stage". All this, (9) it clearly understood, has nothing to do with realities. The question is never of facts, but always of (10) . If a fine speech has been (11) at the proper time and in the proper way, the requirement of the play is met. We are not to go behind the scenes, for that would (12) all the plays in the world. Properly to execute acts like these in all the complex relations of life, is to have "face". To fail them, to ignore them, to be thwarted in the performance of them, this is to " (13) face". Once rightly apprehended, "face" will be found to be in itself a (14) to the combination lock of many of the most important characteristics of the Chinese.

It should be added that the principles which regulate "face" and its attainment are often wholly (15) the intellectual apprehension of the Occidental, who is constantly forgetting the theatrical element, and wandering (16) into the irrelevant regions of fact. To him it often seems that Chinese "face" is not unlike the South Sea Island taboo, a force of undeniable potency, but capricious, and not reducible to rule, deserving only to be abolished and replaced by common sense. At this point Chinese and Occidentals must agree to (17) , for they can never be brought to view the same things in the same light. In the adjustment of the incessant quarrels which distract every hamlet, it is necessary for the "peace-talkers" to take a careful account of the (18) of "face" as European statesmen once did of the balance of power. The object in such cases is not the execution of even-handed justice, which, even if theoretically desirable, seldom (19) to an Oriental as a possibility, but such an arrangement as will distribute to all concerned "face" in due proportions. The same principle often applies in the settlement of lawsuits, a very large percentage of which end in what may be called a (20) game.

9()

A.be

B.is

C.was

D.were

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