函数y=1+log2x(x≥4)的值域是[ ]
A.[2,+∞)
B.(3,+∞)
C.[3,+∞)
D.(-∞,+∞)
答案:C
— Look! Somebody _____the sofa.
— Well, it wasn't me. I didn't do it.
A.is cleaning
B.was cleaning
C.has cleaned
D.had cleaned
第一类建筑物防雷装臵接地体与附近的金属管线地下安全距离是多少米才符合要求?(GB50057-1994(2000版)第3.2.1条)