以多普勒法的谷物收获超声波流量计为研究对象，进行谷物收获系统和超声波流量计的前期研究。
We research corn harvest system of ultrasonic flowmeter by Doppler in this paper, start the prophase research work on corn harvest system and ultrasonic flowmeter.
在收获期绿色烟叶和烘烤前期，没有或含有少量的亚硝酸盐，亚硝酸盐在烘烤期逐渐增加并且与TSNA的积累正相关。
Nitrite is present in very small amount in a green leaf at harvest and during the early days of curing, but increases during tobacco curing and has been positively correlated with TSNA accumulation.
在收获期绿色烟叶和烘烤前期，没有或含有少量的亚硝酸盐，亚硝酸盐在烘烤期逐渐增加并且与TSNA的积累正相关。
Nitrite is present in very small amount in a green leaf at harvest and during the early days of curing, but increases during tobacco curing and has been positively correlated with TSNA accumulation.
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