[单选] 在PowerPoint中，大纲视图窗格中只显示演示文稿的（）。

服务窗口服务用户平均等待时间不应超过（）min。 3。 5。 10。 15。 Perihelion is the point where the Sun（）. is nearest to the Earth。 is farthest from the Earth。 is on the opposite side of the Earth from the Moon。 and Moon and Earth are in line。 If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase（） inspection covers should not be opened until the engine has cooled。 ventilation system should be continued in operation for one hour for cooling。 scavenge pump should be immediately secured to prevent loss of lube oil。 explosion covers should be opened slightly to provide extra ventilatio。 呼叫中心或服务电话及时接通率应大于（）％。 95。 85。 80。 90。 地铁机车采用什么制动系统？ 在PowerPoint中，大纲视图窗格中只显示演示文稿的（）。