问题:
[单选题]
Aa1=a2=2.4m/s2,N=565N
Ba1=4.8m/s2,a2=2.4m/s2,N=345N
Ca1=a2=2.4m/s2,N=345N
Da1=a2=4.8m/s2,N=345N
Aa1=a2=2.4m/s2,N=565N
Ba1=4.8m/s2,a2=2.4m/s2,N=345N
Ca1=a2=2.4m/s2,N=345N
Da1=a2=4.8m/s2,N=345N
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