弱视的最佳治疗年龄为()
A.1~2岁
B.3~6岁
C.7~9岁
D.10~11岁
E.11岁后
参考答案:B
We often have to stay up for our study though we to have enough sleep. [ ]
A.told
B.have told
C.are told
D.were told
动态心电图仪的基本组成包括()。
A.心电图机
B.心电分析软件
C.导联线和记录器
D.计算机系统
E.活动平板