【单选题】
在AE中要实现直角坐标到极坐标转换，可选择（ ）命令。
①
Effect-Obsolete-Path Text
②
Effect-Keying
③
EffectDistortPolar Coordinates
④
Effect-Simulation-CC Snow
【单选题】
坐标增量的“+”或“-”，决定了直线所指向的象限，当直线指向Ⅰ象限时，坐标增量中（ ）。
①
ΔX为+，ΔY为+
②
ΔX为+，ΔY为
③
-ΔX为-，ΔY为+
④
ΔX为-，ΔY为-
【单选题】
A点坐标为（10、20、30），B点坐标为（30、20、30）则AB距离为______。
①
Normal
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③
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④
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铅垂线