Carefully tighten the clamp until it firmly supports the pipette in a vertical position .
把夹子仔细夹紧，直到它把吸量管牢牢地固定在垂直的位置上。
I use only a little aquarium and a pipette to make such shots .
我只用了一个小鱼缸和一个吸液管来完成这些拍摄。
The pipette is washed three times with the internal standard solution . With a10-m l hamilton syringe , 0.5m l of " known " and " unknown " are injected in duplicate , and the alcohol and isobutanol peak heights are measured for each .
