试题与答案

质量为M的汽车以恒定功率P在平直公路上行驶,汽车所受阻力不变,汽车匀速行驶时速度

题型:选择题

题目:

质量为M的汽车以恒定功率P在平直公路上行驶,汽车所受阻力不变,汽车匀速行驶时速度为v1,则当汽车速度为v2时,汽车的加速度大小为(  )

A.

P(v1-v2)
Mv1v2

B.

Pv1v2
M(v1-v2)

C.

P
Mv1

D.

P
Mv2

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C解析:《建设工程安全生产管理条例》规定:施工单位应采取的安全措施有编制安全技术措施、施工现场临时用电方案和专项施工方案,安全施工技术交底,施工现场安全警示标志的设置,施工现场的安全防护,...

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