— does your uncle go to work? —By bike.[ ]
A. How
B. Where
C. What
答案:A
甲数是8,乙数是10,甲数是乙数的( ),写成小数( ),写成分数是( )。
聚光灯、碘钨灯等高热灯具与易燃物的距离不宜小于()。
A.200mm
B.300mm
C.400mm
D.500mm