螺母一般与（）配合，用于紧固两个零件。 A、螺丝 。 B、螺栓、螺柱 。 C、螺钉 。 D、螺柱。
当验明设备确无电压后（）将检修设备接地并三相短路。 过一段时间。 应立即。 可不。
Given: Which statement is true about the class of an object that can reference the variable base? （） It can be any class.。 No class has access to base.。 The class must belong to the geometry package.。 The class must be a subclass of the class Hypotenuse.。
Which three statements are true about persistent configuration?（） (Choose three.) A user cannot set privileges on the persistent lightweight jobs。 Persistent lightweight jobs generate a large amount of metadata。 It is possible to create fully self-contained persistent lightweight jobs。 The use of a template is mandatory to create persistent lightweight jobs。 Persistent lightweight jobs are useful when users need to create a large number of jobs in a short time。
What is used to execute a task at a particular time against any application on a user-defined schedule with user-defined parameters？ （） Sets。 Workflow。 Cron Task。 Notificatio。
当井的遥控紧急关断阀（ESD）打开一个时会产生什么样的结果：（）
