【单选题】An online retailer using the 4Ps marketing mix model should categorise its website under the category of `place'. Is this statement TRUE or FALSE?
【简答题】分析下列化学反应,回答问题。 CaCO 3 + 2HCl = CaCl 2 + H 2 O + CO 2 ↑ Na 2 CO 3 + 2HCl = 2NaCl + H 2 O + CO 2 ↑ (NH 4 ) 2 CO 3 +H 2 SO 4 =(NH 4 ) 2 SO 4 + H 2 O + CO 2 ↑ ⑴从组成上看,CaCO 3 、Na 2 CO 3 、(NH 4 ) 2 CO 3 三种物质...