[填空题] 血液缓冲系统以（）缓冲对最为重要。正常人此缓冲系统比值为（）。

关于土的含水量试验，操作正确的是（） ["烘干法必须在105—110℃下烘至恒重。适用于粘质土、粉质土、砂类土和有机质土","燃烧法适用于测定细粒土的含水量","燃烧应连续三次以后才能称重","烘干时间在4小时以上"] 采用定额比例法计算在产品成本时，所使用的定额主要有（） ["材料定额消耗量","材料定额费用","工时定额消耗量","材料计划单位成本","产品产量定额"] 怎样理解建设社会主义生态文明的重要意义？ Why was the British government interested in New Zealand?（） ["Trade with New Zealand was economically important.","There were no laws to protect Maori rights in dealings with white settlers.","The French government was taking an interest in New Zealand,too.","All of the above."] “票证经济”留给我们的教训是什么？ 血液缓冲系统以（）缓冲对最为重要。正常人此缓冲系统比值为（）。