{"code":1,"msg":"success","data":[{"id":"11","question":"How is the sequence for bleeding brakes determined?","answer":"Bleeding order depends on the hydraulic layout: traditional front\/rear systems start with the caliper farthest from the master cylinder, while diagonal splits follow the service manual\u2019s specified sequence. Vacuum or pressure bleeders help avoid drawing air back in, and the reservoir must stay topped up throughout the process.","views":79427,"likes":"3664","dislikes":3082,"addtime":"100"},{"id":"12","question":"How can you detect that a car is hydroplaning at highway speeds in the rain?","answer":"Hydroplaning makes the steering suddenly light, engine revs climb without corresponding speed, and road noise fades as the tires ride on a film of water. The safest response is to ease off the throttle, keep the wheel straight, and avoid abrupt braking until the tread cuts through and traction returns.","views":9212,"likes":"1200","dislikes":705,"addtime":"100"},{"id":"13","question":"Which regulations must L2+ driver-assistance systems pass before being approved for road use?","answer":"Enhanced Level 2 systems must comply with regional regulations such as UN R79 for steering automation and R152 for AEBS, document functional safety per ISO 26262, and complete ISO 21448 (SOTIF) scenario validation. Regulators also review the human-machine interface, driver-monitoring, and takeover prompts before approving OTA releases.","views":"3109","likes":"580","dislikes":322,"addtime":"100"},{"id":"14","question":"Which production combustion car holds the highest certified top speed, and what is the figure?","answer":"Bugatti\u2019s Chiron Super Sport 300+ hit 490.48 km\/h (304.77 mph) at Ehra-Lessien in 2019, a widely accepted benchmark for production combustion cars even though it was a single-direction run. Extended bodywork, aero tweaks, and a 1,600 PS W16 helped it breach the 300-mph psychological barrier.","views":"2550","likes":"601","dislikes":291,"addtime":"100"},{"id":"15","question":"What core safety differences distinguish solid-state batteries from liquid lithium-ion packs?","answer":"Solid-state cells swap flammable liquid electrolytes for ceramics or polymers, so they resist dendrite penetration and raise thermal runaway thresholds, markedly improving abuse tolerance. The trade-offs are brittle electrolytes, higher interfacial resistance, and expensive fabrication techniques that must accommodate volume changes, which is why commercialization remains gradual.","views":1227,"likes":"411","dislikes":173,"addtime":"100"},{"id":"16","question":"Which scanning architectures are used by mainstream production automotive lidars?","answer":"Production lidars come as spinning multi-beam units offering 360\u00b0 FOV, MEMS-mirror designs that sweep a focused beam across a rectangular window, flash arrays illuminating the entire scene, and emerging optical phased arrays with no moving parts. Each architecture trades cost, resolution, range, and durability, so automakers currently favor MEMS or low-speed spinners while solid-state OPAs mature.","views":"1026","likes":"420","dislikes":173,"addtime":"100"},{"id":"17","question":"Which production vehicle holds the Guinness record for most kilometers driven without an engine replacement, and what was the mileage?","answer":"Irv Gordon\u2019s 1966 Volvo P1800 holds the Guinness World Record for highest mileage on a single-owner car, surpassing 3.2 million kilometers (over 2 million miles) without an engine swap. Diligent maintenance, frequent oil changes, and gentle driving kept the B18 engine alive for decades.","views":672,"likes":"327","dislikes":"161","addtime":"100"},{"id":"18","question":"Why is it advised to start off in a higher gear on icy or snowy roads?","answer":"Starting in second or third gear reduces torque multiplication at the drive wheels, lowering the chance of spinning on slick ice. Combine that with gentle throttle inputs and keep traction control active so the car eases away smoothly instead of surging and losing grip.","views":"569","likes":"297","dislikes":"136","addtime":"100"},{"id":"19","question":"How did Faraday's discovery of electromagnetic induction accelerate early electric-vehicle development?","answer":"Faraday\u2019s discovery that moving magnetic fields induce current enabled dynamos and practical electric motors, laying the foundation for 1890s electric runabouts from makers like Baker and Jeantaud. Those silent, torquey vehicles briefly dominated city streets before gasoline\u2019s energy density and refueling convenience overtook them, but the same electromagnetic principles drive today\u2019s EV renaissance.","views":"476","likes":"272","dislikes":"97","addtime":"100"},{"id":"20","question":"What effect does long-term use of ethanol gasoline have on fuel-system rubber components?","answer":"Ethanol-blend fuel carries moisture and can swell legacy rubber hoses or attack zinc and aluminum parts in carbureted classics, leading to leaks and clogged jets. Modern EFI systems use fluorocarbon-lined hoses and stainless hardware plus ECU fuel trims to cope, but older vehicles often upgrade hoses and gaskets or limit ethanol content to avoid degradation.","views":"775","likes":"333","dislikes":"165","addtime":"100"}]}