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【单选题】
用草酸钠基准物标定高锰酸钾时,指示剂是( )。A.
酚酞
B.
试亚铁灵
C.
高锰酸钾
D.
甲基橙
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【简答题】Recent developments in computer aided design have _____(able) us to produce more cost（填写适当形式的词汇）Recent developments in computer aided design have _____(able) us to produce more cost—effective magazine...
【单选题】Which one is the correct description about computer-aided part programming?
A.
Computer-aided part programming is mostly used in point-to-point applications.
B.
Computer-aided part programming is time-consuming, tedious and complex.
C.
We can view a machining sequence on the screen for debugging in computer-aided part programming.
D.
Computer-aided part programming consists of calculating the dimensional relationships of tool, workpiece and worktable.
【简答题】Robin Richards is skilled in art and computer-aided design, and previously worked for a publicity company.
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