发电机失磁后其本身有何影响？
破伤风最可靠的预防方法是（） ["注射破伤风抗毒素","尽早处理伤口","使用破伤风免疫球蛋白","应用抗生素","注射破伤风类毒素"]
药物的作用是指（） ["药理效应","药物具有的特异性作用","对不同脏器的选择性作用","药物对机体细胞间的初始反应","对机体器官兴奋或抑制作用"]
调压回路和减压回路所采用的主要液压控制元件分别是（）和（）。
Which statement is true about a whole consistent database backup on a database running in ARCHIVELOG mode（） ["The backup will consist of used data blocks only.","The database must be shut down to accomplish the backup.","The backup can be accomplished without shutting down the database.","The backup will contain all database files that have never been backed up."]
与数学表达式
对应的Object Pascal表达式是（）
