一列简谐波在x轴上传播,波的振动周期为0.4 s。已知t=0时刻的波形图如图所示,图中M处的质点此时正经过平衡位置沿Y轴正方向运动,画出t=0.5s时的波形图。
By 16:30, was almost closing time, nearly all the paintings had been sold.[ ]
A.which
B.when
C.what
D.that
以下不符合中枢性瘫痪的特征的是
A.瘫痪以整个肢体为主
B.肌张力下降
C.腱反射亢进
D.无明显肌萎缩
E.病理反射阳性