如果ξ>ξb,说明是小偏心受拉破坏。
参考答案:错
一列简谐横波沿x轴正方向传播,频率为5Hz,某时刻的波形如图所示,介质中质点A在距原点8cm处,质点B在距原点16cm处,从图象对应时刻算起,质点A的运动状态与图示时刻质点B的运动状态相同所需的最短时间为( )
A.0.08s
B.0.12s
C.0.14s
D.0.16s
None of the underwater workers has been harmed by the great fish. ______, most fish were so
friendly that they played with the instruments. [ ]
A. Instead
B. Even though
C. However
D. Though