Who is __________ you? [ ]
A. waiting for
B. waiting with
C. waiting at
D. waiting to
答案:A
仓库内的气瓶放置应整齐,戴好瓶帽;立放时,应妥善固定;横放时,头部朝同一方向,垛高不得超过()层
A.5
B.4
C.3
对平坦地区航空影像而言,若航向重叠度为60%,旁向重叠度为30%,那么,航摄像片所能达到的最大重叠像片数为( )张。
A.4 B.6 C.8 D.9