Important Things to Know When Dining Out
A. The more friends you make in your lifetime
B. The more time you spend in any given country
C. Mexicans consider it inappropriate to eat with utensils
D. Don't get caught making an embarrassing mistake at a restaurant
E. It's a good sign for the chef if you make a mess around your plate
F. Never stick them upright in your food or cross them as you use them
G. It may seem like a simple request to ask for salt and pepper at a meal
DFCGB
为了解某地农村经济情况，对该地农户家庭年收入进行抽样调查，将农户家庭年收入的调查数据整理得到如下频率分布直方图:
甲、乙两城之间的长途客车均由 A 和 B 两家公司运营，为了解这两家公司长途客车的运行情况，随机调查了甲、乙两城之间的 500 个班次，得到下面列联表：
设点M在直线2x+y-1=0上，点(3,0)和 (0,1)均在M上，则M的方程为
已知向量a=(m,3),b=(1,m+1).若a⊥b,则m=__________.
在长方体ABCD- A1B1C1D1,中，已知B1D与平面ABCD和平面AA1B1B所成的角均为30°，则()
