... tracer test 示踪法试验 tracer unit 仿形装置 tracer wheel 描迹轮 ...
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tracer test unit 追踪试验装置
Experiments on the air infiltration by tracer gas method and obtains the range of air infiltration rate per unit length of the crack.
采用示踪气体法对塑钢窗冷风渗透量进行了实验，得出了塑钢窗单位长度渗风量的范围。
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His unit was caught in what Mr Ellicock describes as a Vietnam-style exchange of red and green tracer bullets.
BBC: London Marathon: Ex-paratrooper runs for record
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