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已知竖曲线半径为R,切线长为T,则外距E为( )。(单选题)
.<img alt="" height="50" src="/api/uploads/1487460/in-rich-contentcreated_at=1647283006" width="54">
.<img alt="" height="45" src="/api/uploads/1487461/in-rich-contentcreated_at=1647283006" width="53">
.<img alt="" height="22" src="/api/uploads/1487462/in-rich-contentcreated_at=1647283006" width="54">
.<img alt="" height="20" src="/api/uploads/1487463/in-rich-contentcreated_at=1647283006" width="55">

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