劳动纪律是在共同劳动中的规则和秩序,是安全生产的重要保证。
参考答案:对
At school, some students are active some are shy, yet they can be good friends
with one another.
A.while
B.although
C.so
D.as
正常小儿前囟闭合的年龄是()。
A.10~12个月
B.12~18个月
C.18~20个月
D.2岁
E.2岁半