若有一简谐振动,其位移x=2sin(8t+30),则其加速度的幅值为()。
A.2
B.16
C.128
D.8
参考答案:C
--- What a beautiful day!
--- Yes, it is _______ that I’d like to take a walk.
A.such a nice weather
B.so a nice weather
C.such nice weather
D.so nice weather
鼠标器是当前计算机中常用的( )。
A.控制设备
B.输入设备
C.输出设备
D.浏览设备