单项选择题
A.应距地面高度0~5cm,离墙5~10cm,距天花板50cm B.应距地面高度10~25cm,离墙5~10cm,距天花板50cm C.应距地面高度20~25cm,离墙5~10cm,距天花板50cm D.应距地面高度20~25cm,离墙5~10cm,距天花板100cm E.应距地面高度20~25cm,离墙20~30cm,距天花板50cm
A.40μW/cm2 B.60μW/cm2 C.70μW/cm2 D.90μW/cm2 E.100μW/cm2
A.1~5℃ B.5~10℃ C.15~30℃ D.40~60℃ E.70~80℃