在正四棱锥P-ABCD中,PA=2,直线PA与平面ABCD所成角为60°,E为PC的中点,则异面直线PA与BE所成角为( )
A:90∘
B:60∘
C:45∘
D:30∘
vegetable,opposite,because,get,go
Jim's grandparents live in a black building.____the building is a bus station.Jim always____off the bus there when he comes to see his grandparents.Between the station and the building is a busy street.____down the street three hundred metres and turn right,there is a big market.Jim's grandparents usually buy fruit,meat and____there.Now they are buying beef there.They like living there____it's easy for them to buy what they need and go out.
—Sorry, I can't make it. Will three o'clock be OK?
某中学高三同学就“如何正确理解我国宗教信仰自由政策”举行了一次课堂讨论。下面是四位同学提出的观点,其中正确的是( )
如图所示是岩盐的平面结构,实心点为氯离子,空心点为钠离子,如果将它们用直线连起来,将构成一系列大小相同的正方形.岩盐是____(选填“晶体”或“非晶体”).固体岩盐中氯离子是____(选填“运动”或“静止”)的.