Hi everyone! Good news. A book sale.____will people drive cars in space? Will you meet traffic ____? You'll get answers from our books. Are ____ interesting for you? They can do heavy work. You ____enjoy short working hours. We've got some storybooks about them. What's the best way to buy products at very good prices? Our books will tell you something about online ____? 

    Welcome to the playground this Saturday.

    Have a nice day!

如图是一种自动测定油箱内油面高度的装置，R是滑动变阻器，它的金属滑片是杠杆的一端，且受定位挡板限制只能在电阻上滑动．当油面在A处时，滑动变阻器的滑片恰好在最下端；当油面在B处时，滑动变阻器的滑片在最上端．从油量表（由电流表改装而成）指针所指的刻度，可以知道油箱内油面的高度．现已知油的密度ρ=0.8×10³kg/m³，电源电压是6V，定值电阻R′的阻值是12Ω．

下图示意的是我国正在建设中的敦煌至格尔木铁路（T），全长约506千米。据图，回答下列各题。

遇到雾霾天气时，人们在生产、生活中的应对措施有（    ）

原来室内的电灯正常发光，当把台灯的插头插入插座时(台灯的开关断开)，室内的灯全部熄灭，熔丝熔断，发生这一现象的原因是(　)