My English homework______by my English teacher.(本题1.0分) A、 has not yet graded B、 has not yet been graded C、 is not yet to be graded D、 Is not yet to be graded
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图示桁架中杆件内力等于零,即所谓“零杆”为 。ex_1258955740797_0.jpg
图示桁架中杆件内力等于零,即所谓“零杆”为 。ex_1258955740797_0.jpg(本题3.0分) A、 BC, AC B、 BC, AC, AD