题目

. Being disabled is not terrible, because we can still lead wonderful lives       we don't give up ourselves. A. even if          B. as long as        C. so that          D. now that 答案:B一列简谐横波沿x轴正方向传播,某时刻(t=0)其波形如图所示,a、b、c、d是介质中的四个质元,振幅为A,下列说法正确的是(  ) A、该时刻以后,质元a比质元b先到达平衡位置B、该时刻以后的14周期内,质元a沿x轴移动的距离为1mC、该时刻以后的14周期内,质元b的路程大于质元c的路程D、该时刻以后的14周期内,质元d的位移为零
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