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【简答题】
文章第14段写道:“一大群孩子结队而来,白衣胜雪--他们是幸福的,他们是和平的,他们是洁白的,他们是宁静的,他们是甜蜜的,而这纯净中还包含着一些的无知”。如何理解作者所说的“无知”?
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【单选题】某股份公司因2000年度出现亏损，董事会提议2000年度暂缓发放优先股股息，待以后盈利年度一并发放。根据上述描述，可知该公司发行的优先股属于（ ）。
A.
可转换优先股
B.
参与优先股
C.
股息率可调整优先股
D.
累积优先股
【多选题】箱体加工采用“先面后孔”原则，是由于 。For housing machining, planes'machining is performed prior toholes, because 。
A.
符合先粗后精 Rough machinig prior to finish machinig
B.
符合先主后次 Primary surface machining prior to secondary surface
C.
可简化夹具结构 Simplify the structure of the fixtures
D.
有利于加工孔 Be beneficial to machining holes
【多选题】Select the factors that should be considered In the selection of machining method of a surface.
A.
the design and processing features
B.
machining accuracy
C.
workpiece material and heat treatment
D.
available production conditions and technical level in workshop
【单选题】Eletrochemical machining. electrical discharge machining. and laser-beam machining are
A.
common processes
B.
uinconventional processes
C.
traditonal processes
【单选题】Which stage of maching is to decrease the surface roughness, and to improve the machining accuracy at the same time?
A.
Finish machining phase
B.
Burnish machining phase
C.
Rough machining phase
D.
Semi-finish machining phase
【单选题】We should loads pallet 1 into the ________ for machining purposes.
A.
machining compartment
B.
loading station
C.
working area
D.
office area
【简答题】Machining quality includes machining accuracy and .
【多选题】Select principles of arranging machining operations
A.
To machine the finish datum surfaces in advance
B.
To perform rough machining firstly, then finish machining
C.
To arrange major surfaces, then minor surfaces
D.
Machining plane is in advance of hole making
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