下列哪个图标表示接地（）

A .https://assets.asklib.com/images/image2/2017081809371089317.jpg B .https://assets.asklib.com/images/image2/201708180937178640.jpg C .https://assets.asklib.com/images/image2/2017081809372435443.jpg

A .https://assets.asklib.com/images/image2/2017081811160477395.jpg B .https://assets.asklib.com/images/image2/2017081811160911786.jpg C .https://assets.asklib.com/images/image2/2017081811161386533.jpg

A .https://assets.asklib.com/images/image2/2017081810413116247.jpg B .https://assets.asklib.com/images/image2/2017081810413641886.jpg C .https://assets.asklib.com/images/image2/2017081810414038703.jpg

A .https://assets.asklib.com/images/image2/2017081809322727950.jpg B .https://assets.asklib.com/images/image2/2017081809323181728.jpg C .https://assets.asklib.com/images/image2/2017081809323847098.jpg

A .https://assets.asklib.com/images/image2/2017081810510813144.jpg B .https://assets.asklib.com/images/image2/2017081810511235545.jpg C .https://assets.asklib.com/images/image2/2017081810511715691.jpg

A .https://assets.asklib.com/images/image2/2017081809294976322.jpg B .https://assets.asklib.com/images/image2/2017081809300835545.jpg C .https://assets.asklib.com/images/image2/2017081809301674676.jpg

A .https://assets.asklib.com/images/image2/2017081810485197451.jpg B .https://assets.asklib.com/images/image2/2017081810485561159.jpg C .https://assets.asklib.com/images/image2/2017081810485912745.jpg

A .https://assets.asklib.com/images/image2/2017081810542287570.jpg B .https://assets.asklib.com/images/image2/2017081810542721646.jpg C .https://assets.asklib.com/images/image2/2017081810543028354.jpg

A .https://assets.asklib.com/images/image2/2017081811021797425.jpg B .https://assets.asklib.com/images/image2/201708181102251707.jpg C .https://assets.asklib.com/images/image2/2017081811022935360.jpg

A .https://assets.asklib.com/images/image2/2017081809290457345.jpg B .https://assets.asklib.com/images/image2/2017081809290915996.jpg C .https://assets.asklib.com/images/image2/2017081809291725692.jpg

A .https://assets.asklib.com/images/image2/2017081810533569199.jpg B .https://assets.asklib.com/images/image2/2017081810533921902.jpg C .https://assets.asklib.com/images/image2/2017081810534338971.jpg

A .https://assets.asklib.com/images/image2/2017081810515920412.jpg B .https://assets.asklib.com/images/image2/2017081810520372027.jpg C .https://assets.asklib.com/images/image2/201708181052079459.jpg

A .https://assets.asklib.com/images/image2/2017081811123471428.jpg B .https://assets.asklib.com/images/image2/2017081811123883808.jpg C .https://assets.asklib.com/images/image2/2017081811124239408.jpg

A .https://assets.asklib.com/images/image2/201708181058208849.jpg B .https://assets.asklib.com/images/image2/2017081810582893191.jpg C .https://assets.asklib.com/images/image2/2017081810583134362.jpg

A .https://assets.asklib.com/images/image2/201708181045185134.jpg B .https://assets.asklib.com/images/image2/2017081810452350252.jpg C .https://assets.asklib.com/images/image2/2017081810452782690.jpg

A .https://assets.asklib.com/images/image2/2017081810454646970.jpg B .https://assets.asklib.com/images/image2/2017081810455169137.jpg C .https://assets.asklib.com/images/image2/2017081810455514554.jpg

A .https://assets.asklib.com/images/image2/2017081810563388876.jpg B .https://assets.asklib.com/images/image2/2017081810563885040.jpg C .https://assets.asklib.com/images/image2/2017081810564277431.jpg

A .https://assets.asklib.com/images/image2/2017081810554744429.jpg B .https://assets.asklib.com/images/image2/2017081810555162044.jpg C .https://assets.asklib.com/images/image2/2017081810555690369.jpg

A .https://assets.asklib.com/images/image2/2017081811165093646.jpg B .https://assets.asklib.com/images/image2/2017081811165470393.jpg C .https://assets.asklib.com/images/image2/2017081811165962393.jpg

A .https://assets.asklib.com/images/image2/2017081810394530519.jpg B .https://assets.asklib.com/images/image2/2017081810394994281.jpg C .https://assets.asklib.com/images/image2/2017081810395687227.jpg

A .https://assets.asklib.com/images/image2/201708181047199202.jpg B .https://assets.asklib.com/images/image2/2017081810472424268.jpg C .https://assets.asklib.com/images/image2/2017081810472913541.jpg

A .https://assets.asklib.com/images/image2/2017081811070323298.jpg B .https://assets.asklib.com/images/image2/2017081811070990011.jpg C .https://assets.asklib.com/images/image2/2017081811071241562.jpg

A .https://assets.asklib.com/images/image2/2017081809362956474.jpg B .https://assets.asklib.com/images/image2/2017081809363297918.jpg C .https://assets.asklib.com/images/image2/2017081809363794140.jpg

A .https://assets.asklib.com/images/image2/2017081810403034037.jpg B .https://assets.asklib.com/images/image2/2017081810403630841.jpg C .https://assets.asklib.com/images/image2/2017081810404195261.jpg