在防护罩表面开口透孔，且透孔宽度大于粉笔擦最大宽度。
A through hole is arranged on the surface of the hood. The width of the through hole is larger than the maximum width of a blackboard brush.
混凝土地坪的爆破拆除既可以用常规浅孔破碎法也可以用透孔法。
Both common shallow-hole blasting and through-hole blasting can be used for demolition of concrete ground.
可以印刷透孔、通孔层、电阻温度系数较低的电阻、热敏电阻， 5毫升容量。
Printing capabilities include thru hole, multi layer, low TCR resistors, thermistors, and 5 mil line and space capability. Substrates of up to 4 inch X 5 inch can be accommodated.
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