第9题: [单项选择]All electrical appliances aboard a vessel should be grounded to(). A. prevent them from falling when the vessel rolls B. protect personnel from electrical shock C. increase their operating efficiency D. prevent unauthorized personnel from operating them 参考答案:B
第10题: [单项选择]含酯键药物性质不稳定的主要原冈是 A. 自动氧化 B. 水解 C. 聚合 D. 还原 E. 异构化 参考答案:B