目前,光纤通信所用的光波长范围为()。
A.500nm~1000nm
B.800nm~1600nm
C.850nm~1550nm
D.300nm~1500nm
参考答案:B
(2013·高考天津卷)I think watching TV every evening is a waste of time—there are________ meaningful things to do.
A.less
B.more
C.the least
D.the most
统计行政规章是指国务院各部委和具有行政管理权的国务院直属机构制定的统计行政规章。( )