upper sieve extension 上筛的延长部分 ; 上筛延长部分
Under the same experiment conditions, the shrunk stream diameter of upper taper sieve trays is maximum, common sieve trays' is second, and lower taper sieve trays' is minimum.
在同等测试条件下，经过上锥形筛孔的缩脉最大，其次是经普通筛孔的缩脉，最小的缩脉为经下锥形筛孔的缩脉。
The ATPase activity at the plasmolemma of the sieve cells of the branches of the upper part is higher than that of the basal part.
灌浆前期，稻穗上部枝梗筛管细胞质膜上的ATP酶活性比下部强；
A mass of water entered molecular sieve adsorber, upper column and lower column during the heating period before startup of air separation unit.
空分设备启动前的加温阶段，分子筛吸附器和空分塔上、下塔大量进水。
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