第27题:[单选题]( )S1:What is the result of search? S2:The result of search is negative. Q:What does the second speaker mean? A.She has found a floating object B.She has found a lifeboat C.She has found a liferaft D.She has found nothing 参考答案:D
第28题: [单项选择]下列抗氧剂中不易用于偏酸性药液的是() A. 硫代硫酸钠 B. 亚硫酸氢钠 C. 焦亚硫酸钠 D. 生育酚 E. 二丁甲苯酚 参考答案:A