age class造句怎么写

But stand volume descents to a great extent, age class and stand density structure are maladjusted badly, and the number of stand growth is low.

register storage class

Among them, 35~age group was the maximum of death age class, constituting 29.1% of constitution of causes of death.

The potential clone population consist of rhizome buds of 0 age class and tillering node buds of 1 age class, of which 0 age class constitute the majority, 84.8%.

national standard age classification