The main barrier for the quick development of car-sharing is______.
A. the high cost of rental and duration
B. the reliability of car-sharing firms
C. the reliability of car renters
D. the attitude of car-owners
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During check on top clearance in main bearings, turn the crankthrow for the relevant cylinder unit to ____ and stop the lube oil circulating pump.
A. port side
B. starboard side
C. BDC position
D. TDC position
豆科植物可以分泌有螯合作用的分泌物供应给玉米。()
众多国家在上世纪迎来了“倒U型”拐点，唯独中国农业的“减肥拐点”迟迟没有出现。()
Compared with WhipCar, RelayRides______.
A. lets owners to decide renters
B. is stricter with cars" security
C. offers lower rental prices
D. provides more services
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