[单选] 我国烟煤分类为（）类。

SQLSever2000在在线备份时不允许执行哪些操作？ Refer to the exhibit. ROUTE.com is planning to implement a new secure OSPF network to support traffic between clients on the 172.16.10.0/24 network and the file server on th e 172.16.20./24 network. You have been asked to review the implementation plan for the OSPF project. Which statement about the plan is true?（） It is complete as written.。 It should include a task that shuts down all unused interfaces.。 It sho uld include tasks that enable and verify OSPF authentication.。 It should include a task that establishes a file transfer baseline before and after the configuration is changed.。 高压共轨系统主要由（）和各种电子元件组成。 油箱。 电控单体泵。 高压输油泵。 共轨。 喷油器。 饱和水汽压表示（）。 空气的潮湿程度。 空气中水汽所产生的分压力。 空气中能含水汽的最大限度。 空气中水汽的含量。 开展“两学一做”学习教育，应坚持反面教育为主原则。 我国烟煤分类为（）类。