户外落地变压器外廓与建筑物外墙距离小于()M时,应考虑对建筑物的防火要求。
A、4
B、5
C、1
参考答案:B
Today there are more opportunities for disabled people to make _____ contribution to _____ society. [ ]
A. a; the
B. a; /
C. /; the
D. the; a
4a+4b=4ab______.(判断对错)