A:甲—①
B:乙—②
C:丙—③
D:丁—④
穿越时空隧道,神游北宋东京。看杂耍踢球,听说书唱曲,赏古玩字画……我们来到的娱乐兼商业场所是( )
选择符合内容情景的图片( )
如图所示,在空间直角坐标系中BC=2,原点O是BC的中点,点A的坐标是(32,12,0),点D在平面yOz上,且∠BDC=90°,∠DCB=30°,则向量OD→的坐标为( )
In yesterday's business training course the consultant instructed us that a good salesman must be ______ if he wants to succeed.