如图a、b所示两结构，若将结构上作用的力合成为一合力， 然后求支座反力。（; ;;）; ; ; ; ; ;;
? a可求，b不可求；|a、b都不可求；|a、b都可求；|b可求，a不可求；
? a可求，b不可求；|a、b都不可求；|a、b都可求；|b可求，a不可求；
举一反三
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