离子色谱法测定环境空气中氨时，所用的淋洗液为0.02mol／L的甲基磺酸。
参考答案：对
建筑物围护结构的隔热性能的现场检测仅局限于建筑物的屋面和（）。
A、东西外墙
B、南墙
C、北墙
D、南北外墙
When a pencil is partly in a glass of water, it looks as if it ______. [A] breaks [B] has broken [C] were broken [D] had been broken
