题型:填空题 根据汉意或首字母提示完成句子。1. The prisoners a______ to escape, but failed. 2. I have an important ______ (约会) at 3 p.m. 3. I'm very a______ about my son's health. 4. There would be too many people in the ______ (交响乐) hall. 5. Getting this contract is c______ to the future of our company. 查看答案
题型:多项选择题 理想的脑显像剂需具备哪些条件()。A.药物在血液中清除比较快B.病变与正常脑组织对比度好C.所使用的放射性核素能量及半衰期适当对人体无害D.价廉,易于获得和制备E.半衰期越短越好 查看答案