网络上的信息有真有假,经常在网海漫游,我们应当()。
A.不负责任地玩
B.学会保护自己
C.随便攻击他人
D.随意转发信息
参考答案:B
The finding which ________ the research is very important. [ ]
A. basing on
B. base on
C. to base on
D. is based on
正常燃烧导火索的燃烧速度为()。
A、180s/m-210s/m
B、100s/m-125s/m
C、240s/m-350s/m