如果lg m+lg n=0,那么m+n的最小值是 ______.
∵lg m+lg n=0
∴lgmn=0=lg1即mn=1
∵m>0,n>0
∴m+n≥2mn=2
故答案为2
_____ the oil price is on the rise, lots of people go to work by BMW instead of driving cars.
A.So that
B.Even enough
C.As if
D.Now that
大便时排出鲜血,肉眼见血与便不混,大便成形。应首选的检查是
A.大便常规镜检
B.肛门直肠指检及直肠镜检查
C.乙状结肠镜
D.纤维结肠镜