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【单选题】
合理的运用游戏可以提高体育教学的 () 。A.
有效性
B.
科学性
C.
目的性
D.
客观性
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反馈参考答案：
举一反三
【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
【判断题】the guideway surface should have a small and even machining allowance in machining
A.
正确
B.
错误
【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 .
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