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【简答题】
何谓混凝土的塑性收缩、干缩、自收缩和？其影响因素有哪些？收缩与对混凝土的抗裂性有何影响？
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皮皮学刷刷变学霸
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.
【简答题】The drilling process is used in both suce and underground mines for which are conducted to fragment the rock.
【单选题】在学习《长方形和正方形周长》时，张老师将能够正确计算长方形和正方形的周长的是学习目标之一，该目标属于（ ）。
A.
知识性目标
B.
过程性目标
C.
技能型目标
D.
情感性目标
【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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