WY 1 in stake Cascade Impacted was used to measure the particle size classification of dusts and the fractional collecting efficiencies of dust collectors.
采用WY 1型冲击式尘粒分级仪测量各尘源排放粉尘的粉尘粒径分级组成和除尘器的粒径分级除尘效率。
WY: How about in the picture that I just mentioned. What is that thing in the middle of the picture?
王寅：比如我刚才举例的那张照片，正中间的那个，那是一种什么东西？
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