起重机启动前应将主接触器接合，各操作杆放在空档位置。
Your network contains a server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2). You create a domain account named Admin1. You need to configure the security for Admin1 to meet the following requirements: Allow Admin1 to monitor events in the system event log and the application event logAllow Admin1 to create and view counter logs in Performance MonitorMinimize the user rights assigned to Admin1 To .which group should you add Admin1?（） ["Power Users.","Administrators.","Performance Log Users.","Performance Monitor Users."]
用一个液压泵驱动几个工作机构需要按一定的顺序依次动作时，采用（）。 ["方向控制回路","调速同路","顺序动作同路","速度换向同路"]
稻田发生的雨久花科杂草主要有哪些？
汇票的当事人有三方，即（）。 ["出票人","贴现人","背书人","付款人","收款人"]
行人辞令
