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【简答题】
个案工作常用的工作方式：会谈、访视、（）
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反馈参考答案：
举一反三
【简答题】In the well drilling process, a revolving steel at the bottom of a string of pipe a hole through the rock layers.
【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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