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【单选题】
Decide which of the choice given below would best complete the passage if inserted in the corresponding blanks. Mark the best choice for each blank on your answer sheet. People thinking about the origin of language for the first time usually arrive at the conclusion that it developed gradually as a system of grunts, hisses and cries and ____26 a very simple affair in the beginning. ______27 when we observe the language behavior. of ____28 we regard as primitive cultures, we find it _____29 complicates. It was believes that an Eskimo must have at the tip of his tongue a vocabulary of more than 10,000 words ___30 to get along reasonably well, much larger than the active vocabulary of an average businessman who speaks English. ______31, These Eskimo words are far more highly inflected (词尾变化的)than _____32 of any Of the well-known European languages, for a ___33 noun can be spoken or written in ______34 hundred different forms, each ___35 a precise meaning different from that of any other. The forms of the verbs are even more _____36. The Eskimo language is, therefore, one of the most difficult in the world to learn, ______37 the result that almost no traders or explorers have ___38 tried to learn it. Consequently, there has grown up, in communication between Eskimos and whites, a jargon ___39 to the pidgin English used in Old China, with a vocabulary of from 300 to 600 uninflected words. Most of them are derived from Eskimo but some are derived from English, Danish, Spanish, Hawaiian and other languages. It is this jargon that is usually _____by travelers as the Eskimo language. 26.
A.
must be
B.
must have been
C.
ought to be
D.
should be
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【单选题】环烷烃的分子通式是
A.
CnH2n+2
B.
CnH2n
C.
CnH2n-2
D.
CnH2n-4
【简答题】环烷烃分子的通式是()
【判断题】影响切削力的因素很多,其中最主要的是刀具材料、刀具磨损和切削液。
A.
正确
B.
错误
【简答题】直链烷烃分子通式为_____,单环烷烃的分子通式为_____。
【多选题】影响切削力的因素很多,其中最主要的是()
A.
切削用量
B.
刀具几何形状与几何角度
C.
工件材料
D.
刀具材料
【多选题】影响切削力的因素很多,其中最主要的是 ( )
A.
工件材料
B.
刀具材料
C.
刀具几何形状与几何角度
D.
切削用量
【判断题】学生的轮转实习主要是在教学动物医院内完成的。
A.
正确
B.
错误
【判断题】一般情况下,冬天应遵循“争取日照,防避冷风”的原则,而在夏天则遵循“创造荫处,争取通风,积极利用天空辐射冷却 ” 的原则。
A.
正确
B.
错误
【多选题】影响切削力的因素很多,其中最主要的是( )
A.
工件材料
B.
切削用量
C.
刀具材料
D.
刀具几何形状与几何角度
【判断题】影响切削力的因素很多,其中最主要的是刀具材料、刀具磨损、切削液。( )
A.
正确
B.
错误
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