---- Excuse me, could you please tell me the way to the nearest hospital?
---- I'm sorry, _I am new here. You can ask the policeman over there.
A:and
B: but
C:so
一探照灯照射在云层底面上,云层底面是与地面平行的平面,如图所示,云层底面距地面高h,探照灯以角速度ω在竖直平面内转动,当光束转到与竖直方向夹角为θ时,云层底面上光点的移动速度是( )
下列有关哺乳动物胚胎发育和胚胎工程的叙述,不正确的是( )
函数fx=-x-1-1≤x<0-x+10<x≤1,则fx-f-x>-1的解集为( )