closed ring

同根派生

I think so. Exams like a closed ring around our minds. It's time to carry out a reform indeed.
我也這麽認爲。考試象個圈套禁錮著我們的頭腦,確實該改革了。
Its chemical properties are similar to those of alkanes, but its molecule is in the form of closed ring.
其化學性質與烷烴相似，但其分子是閉環形式。
The process of changing an open-chain hydrocarbon structure to a closed ring, e.g., hexane to benzene.
使開鏈烴結搆變成閉環烴的過程，例如使己烷變成苯。
Naphthenic having the characteristics of naphthense,which are saturated hy_drocarbons containing molecules with at least one closed ring of carbon atoms.
環烷烴具有環烷特性的、至少包含一個碳原子閉鏈的飽和烴。
Options: the problem of collisions that occur when two stations transmit at the same time.This solution is accomplished by creating a closed ring and using an electronic.
它是通過建立一個關閉的環和用一個脩正的令牌來實現的。