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.
我也这么认为。考试象个圈套禁锢着我们的头脑,确实该改革了。
Its chemical properties are similar to those of alkanes, but its molecule is in the form of closed ring.
其化学性质与烷烃相似，但其分子是闭环形式。
The process of changing an open-chain hydrocarbon structure to a closed ring, e.g., hexane to benzene.
使开链烃结构变成闭环烃的过程，例如使己烷变成苯。
Naphthenic having the characteristics of naphthense,which are saturated hy_drocarbons containing molecules with at least one closed ring of carbon atoms.
环烷烃具有环烷特性的、至少包含一个碳原子闭链的饱和烃。
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.
它是通过建立一个关闭的环和用一个修正的令牌来实现的。