单项选择题

标志着畜肉腐败变质的开始是下列哪个现象的出现（）。

A．僵直
B．成熟
C．自溶
D．腐败

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单项选择题

The weight of block B is P=2kN, and the weight of block A is Q=5kN. A horizontal force F is applied to B. As shown in the figure, when the rope of A and the horizontal form an angle of θ=30°, the static sliding friction coefficient between B and the horizontal plane is fs1=0.2, the static sliding friction coefficient between the block A and B fs2=0.25, the minimum value of the horizontal force F required to pull out the block B is ________. A、2.65kN B、2.366kN C、1.4kN D、1.5kN

判断题

4、矿山法的核心是保护和爱护岩体

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