封单
封单-
现场施工效果表明，双封单卡分段压裂管柱在承压性能及过砂量要求上，能满足要求；
Field application results show that the string of double-sealing and single-stick subsection fracturing can meet the demands of pressurization behavior and sand amount .
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脂微球是一种以脂肪油为软基质并被磷脂包封的单分子层微粒体分散系。
Lipo microsphere is a monomolecular dispersing system .
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麦格寄来了一封录取通知单&一份邀请书。
McGonagall sends an acceptance letter & an invitation to attend .
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采用银导电胶复合封接的单体电池放电前后泄露率不变。
The leakage rates of single cell sealed by gradient sealing of electric adhesive was not changed before and after discharge testing .