What did the first automated car use to track street markers?
A. Global Position System
B. Cameras and analog computer
C. BeiDou Navigation Satellite System
D. Facial Recognition
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What can't be done by a driverless delivery vehicle?
A. Clean the road.
B. Obey traffic lights.
C. Avoid barriers on roads.
D. Send messages to tell the customers.
泥浆护壁成孔灌注桩的护筒一般采用4~8mm厚钢板制作，其内径比钻头直径大（），上部宜开1~2个溢浆口。
A. 50mm
B. 100mm
C. 150mm
D. 200mm
起重高度(H)和起重半径(R)三个参数表示,它们之间的关系有( )
A. 当起重臂长度一定时,随着仰角增大,Q和H增加,而R减小
B. 当起重臂长度一定时,随着仰角增大,Q和R增加,而H减小
C. 当起重臂长度一定时,随着仰角增大,H和R增加,而Q减小
D. 当起重臂长度一定时,随着仰角增大,H增加,而Q和R减小
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