简支梁受力如图2示,则下述正确的是( )。
FQC(左)=FQC(右),MC(左)=MC(右)
FQC(左)=FQC(右)-F,MC(左)=MC(右)
FQC(左)=FQC(右)+F,MC(左)=MC(右)
FQC(左)=FQC(右)-F,MC(左)≠MC(右)
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