质谱中质荷比最大的峰不一定是分子离子峰。( )
参考答案：对
Was it _____ he was playing volleyball on the playground _____ he got hurt? [ ]
A. that; when
B. when; that
C. that; where
D. where; that
金融信用信息基础数据库用户管理原则应包括：（）等。
A、权限控制原则
B、监督制约原则
C、责任落实原则
D、信息安全保护原则
