A:As soon as arriving
B:Upon he arrived
C:On arriving
D:Upon arriving at
“阿里山的姑娘美如水,阿里山的少年壮如牛。“这首歌唱的是( )
一只空心球总体积为V,球腔容积为V/2,当腔内不灌水时,它在水中有一半露出水面,若将球腔内注满水再放入水中,则()