什么是阳光控制镀膜玻璃?
参考答案:
阳光控制镀膜玻璃是对波长350~1800nm(0.35~1.8μm)的太阳光(见图218)具有一定控制作用的镀膜玻璃。
I soon found that the work I was doing ____ by someone else — in other words, I was wasting my time.
A.had already been done
B.has already been done
C.would be done
D.have already been done
目前,用于发展无线上网卡的号段有()
A.130部分号段
B.132部分号段
C.156部分号段
D.186号段
E.145号段