m.double" target="_blank">System<span id="LST3EF076C0_1"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST3EF076C0_1?cs=.|vb=.|cpp=::|nu=.|fs=.");</script>Double</a><br />千米</dd></dl><h4 class="subHeading">返回值</h4>类型：<a href="https://docs.microsoft.com/dotnet/api/system.double" target="_blank">Double</a><br /></div><div class="collapsibleAreaRegion" id="seeAlsoSection"><span class="collapsibleRegionTitle" onclick="SectionExpandCollapse('ID2RB')" onkeypress="SectionExpandC