第30题: [单项选择]The application of infrared scanning technology to agriculture met with some difficulties due to ______. A. the lack of official support B. its high cost C. the lack of financial support D. its failure to help increase production 参考答案:C 答案解析:[解析] 文中已明确点出原因是缺乏资金支持。
第31题: [单项选择]在制剂中作为金属离子络合剂使用的是() A. 草酸钙 B. 焦亚硫酸钠 C. 依地酸二钠 D. 枸橼酸 E. 盐酸 参考答案:C 答案解析:依地酸二钠是常见的金属离子络合剂。