The paper introduces the method of azotobacter fertilizer by biological process and test method of bacteria.本文介绍了生物法制固氮菌肥的方法,以及菌种的检验方法.Bacterial ferritin from Azotobacter vinelandii has qualitative characteristic absorpt...
The only electrician we could get hold of was miles away.我们唯一能够联络到的电工离这里有好几英里远。We need an electrician to mend the iron.我们要请电工修理熨斗.Bodeau's 1988 exchange guest, Nick Aldrich, an electrician from Lynnwood, Washington,...