WY: This is mostly in the Southwest?
王寅：主要集中在西南?。
WY: But dawn and dusk are very short, and you're right out in the street.
王寅：但是清晨黄昏时间都比较短，你又都是在大街上拍。
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？
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WY1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 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WY1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。
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