
低近视力测试时,记录被测眼能看清的最小视标的行序视标值,并记录单个视标。
A.对 B.错


A.对 B.错
Many parents make their children do chores around the house. For some families, teaching children what to do and how to do chores is easy. But in other families, getting children to do some housework can be a very big problem.
It is a good idea for parents to teach their children at an early age that all family members must work together to make the house clean, and each person must do his or her share(份) of the work. We can do this by starting a plan of chores and responsibilities when children are young.
Chores are good for children-even very young ones. Doing chores teaches children many important skills such as working together and being responsible. Jobs also teach children what is fair and doing things for others. The skills and values from doing chores will do good to children all their lives.
1. The first paragraph tells us .
A. all the parents make their children do chores
B. it's easy to teach children to do chores
C. some children think doing chores is difficult
D. it is different on teaching children to do chores among different families
it is different on teaching children to do chores among different families
线性规划模型若有最优解,则最优解必是基可行解