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【判断题】
数控车床的机床原点是操作者根据个人的习惯而设定。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】自2009年1月1日起，增值税纳税人以1个月或者1个季度为1个纳税期的，自期满之日起10日内申报纳税。（ ）
【判断题】The drilling process is only used in underground mines for blasting operations .
A.
正确
B.
错误
【单选题】Gun drilling processes are to make ( ).
A.
deep holes
B.
large holes
C.
thread holes
D.
all of the above
【单选题】Gun drilling processes are to make ( ).
A.
large holes
B.
thread holes
C.
deep holes
D.
all of the above
【单选题】What is aim of post treatment in drilling of PCB production process?
A.
To rough the copper pattern surface and increase the bonding strength between copper and resin.
B.
To make the pressed inner layer in good shape and some holes are drilled for later procedure
C.
To use heating system to melt the resin then use by vacuum chamber and pressure to fill up the empty space and cure the resin at the same time.
D.
To organize the inner layer sequence and stacking.
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