下图“▲3633山峰海拔／m”属于地图三要素中的
A．比例尺
B．方向
C．图例和注记
D．图名
答案：C
It never occurred to humans until the mid1990s ________ some animals can be cloned. [ ]
A . where
B. that
C. which
D. what
在带电设备垂直上方作业有何规定和要求？
