题目

Attention Tim Hortons Stainless Steel Travel Mug Owners Lid Recall-15 oz Stainless Steel Travel Mug A fault at the cup has been recognized. The fault may result in some lids lifting slightly from the body of the mug, and could probably cause injury from hot liquid leaking. Therefore, we have given an immediate lid recall notice. This Recall notice is related only to Tim Hortons 15 oz Stainless Steel Travel Mugs sold between October 2002 and January 2003. The bottom of the mug is stamped with distributor's (经销商) name, ThermoServ. There is no printing on the handle of the mug. 下列关于实验操作步骤的叙述中正确的是 A.斐林试剂甲液和乙液可直接用于蛋白质鉴定B.脂肪的鉴定实验中需用显微镜才能看到细胞中被苏丹Ⅲ染成橘黄色的脂肪滴C.鉴定可溶性还原糖时要加入斐林试剂甲液后再加入乙液D.用于鉴定蛋白质的双缩脲试剂A和B液要混合后,再加入含样品的试管中
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