铝中的纵波声速为6.25×103m/s,声波通过50mm铝的时间为()。
参考答案:8μs
外感风热或风寒化热者慎用的治鼻鼽鼻渊剂是()。
A.鼻炎康片
B.千柏鼻炎片
C.藿胆丸
D.鼻渊舒胶囊(口服液)
E.辛芩颗粒
Could you speak more loudly?()
A.It's a good line
B.The line is bad
C.I can hear you
D.You can't hear me