“一通三防”中“三防”是指:防治()、防治()和防()。
A、瓦斯
B、煤尘
C、灭火
参考答案:A, B, C
---Imagination important in science, and it helps us dream up our future.
---You are definitely right. If only something allow me to see insects and spiders magnified without getting close to them.
A.was; would
B.is; will
C.will be; can
D.is ;could
该省人口处于负增长的年份是()
A.1970年
B.1948-1956年
C.1945年
D.1965年