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【判断题】
因果链分析中,同一层级的缺点要用And或Or运算符连接起来。A.
正确
B.
错误
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【单选题】What is aim of lamination in dry outer film of PCB production process?
A.
To remove some contaminants on the copper surface, increasing surface roughness of copper
B.
To create photo resist layer on outer layer for pattern creation
C.
To transfer the original film image onto a photo sensitive plate by light irradiation
D.
To make sure the vias connecting different inner layers smooth and bare,make it easier for Panel plating.
【单选题】What is aim of pattern plating in outer layer of PCB production process?
A.
To remove some contaminants on the copper surface, increasing surface roughness of copper
B.
To transfer the original film image onto a photo sensitive plate by light irradiation
C.
To protect copper from corrosion
D.
To increase copper thickness after the procedure of developing
【简答题】电动放风阀属于阀口式空气阀, 它由( )与 ( ) 两部分组成。
【简答题】妇产科腹部手术时备皮范围上自____________，两侧至____________，下达____________。外阴和阴道手术时备皮范围上至____________，下至____________，包括腹股沟、外阴和大腿上1/3。
【简答题】妇产科手术中腹部手术与外阴、阴道手术患者术前备皮范围?
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