电动机电源电压一般不应高于或低于额定值的（），最低不低于15%，且任俩相电压差不超过三项平均值的5%。 ["15%","7%","5%","6%"]
不能被委托为辩护人的有（） ["外国人、无国籍人","该案的证人、鉴定人","被剥夺政治权利的人","同犯罪嫌疑人、被告人的犯罪活动有牵连的人"]
You work as an application developer at Certkiller .com. Certkiller .com has asked you to create a multi-threaded application， which executes a critical database backup operation on an hourly basis. You define this operation with the following code： public void BackupDB （） { //Implementation code } You then create a Thread object for the purpose of invoking this method. You need to ensure that the thread is scheduled for execution before any other thread at runtime.What should you do？（） ["A","B","C","D"]
预制外挂墙板安装施工前应编制专项施工方案，并经（）批准。 ["A.施工总承包企业技术负责人及总监理工程师 ","B.项目技术负责人及总监理工程师 ","C.施工总承包企业技术负责人及项目技术负责人 ","D.项目安全负责人及总监理工程师"]
何谓矿床、同生矿床、后生矿床和叠生矿床？
塔西佗
