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【多选题】
上市公司在其年度资产负债表日后至财务会计报告批准报出日前发生的下列事项中，属于非调整事项的有( )。A.
因发生火灾导致存货严重损失
B.
发生企业合并
C.
因外汇汇率发生重大变化导致外币存款严重贬值
D.
发现前期存在重大的会计差错
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【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.
【简答题】The drilling process is used in both suce and underground mines for which are conducted to fragment the rock.
【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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