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【单选题】
关于作用力与反作用力,下列说法中正确的有( )A.
物体相互作用时,先有作用力,后有反作用力
B.
作用力与反作用力大小相等,方向相反,作用在同一直线上,故这两个力合力为零
C.
作用力与反作用力可以是不同性质的力,例如,作用力是弹力,其反作用力可能是摩擦力
D.
作用力和反作用力总是同时分别作用在相互作用的两个物体上
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【单选题】Most of the animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however, two kinds of animals come together in a partnership which is good for b...
A.
they can eat its parasites
B.
they enjoy traveling with the sheep
C.
they depend on the sheep for existence
D.
they find the position most comfortable
【单选题】Most of the animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however, two kinds of animals come together in a partnership which is good for b...
A.
they can eat its parasites
B.
they enjoy traveling with the sheep
C.
they depend on the sheep for existence
D.
they find the position most comfortable
【简答题】B Most of the animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however. two kinds of animals.come together in a partnership which is good for...
【单选题】Most of the animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however, two kinds of animals come together in a partnership (伙伴关系) which is goo...
A.
they can eat its parasites
B.
they enjoy travelling with the sheep
C.
they depend on the sheep for existence
D.
they find the position most comfortable
【单选题】大众轿车的发动机采用热膜式进气流量传感器，技师甲说当进气流量传感器电路断路时，PCM会存储故障码，并采用替代值，根据发动机转速、节气门开度和进气温度计算替代值。技师乙说当进气流量传感器电路断路时，PCM会存储故障码，并采用替代值，根据节气门开度计算替代值
A.
甲正确
B.
乙正确
C.
甲和乙都不正确
D.
甲和乙都正确
【单选题】技师甲说当进气流量传感器电路断路时，PCM会存储故障码，并采用替代值，根据发动机转速、节气门开度和进气温度计算替代值。技师乙说当进气流量传感器电路断路时，PCM会存储故障码，并采用替代值，根据节气门开度计算替代值
A.
甲正确
B.
乙正确
C.
甲和乙都不正确
D.
甲和乙都正确
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