更多"(Sound waves) travel (in the air) i"的相关试题:
[单项选择](Sound waves) travel (in the air) in much (the same) way (like) water waves spread on the water.
A. Sound waves
B. in the air
C. the same
D. like
[单项选择]When we speak, sound waves begin to travel and go in all directions.
A. 当人们说话时，声音向四面八方传开。
B. 当我们说话时，声音就开始传播，并且向四面八方传开。
C. 当我们说话时，声波开始传递，而且向四面八方传播。
D. 当说话时，声波就开始旅行，并且走向四面八方。
[单项选择]When we speak，sound waves begin to travel and go in all directions．
A. 当人们说话时，声音向四面八方传开。
B. 当我们说话时，声音就开始传播，并且向四面八方传开。
C. 当我们说话时，声波开始传递，而且向四面八方传播。
D. 当说话时，声波开始旅行，并且走向四面八方。
[单项选择]Without the worker's help, Sam ______ so much progress.
A. would not make
B. would not have made
C. will not make
D. did not make
[单项选择]SAM征见于
A. 扩张型心肌病
B. 大量心包积液
C. 二尖瓣脱垂
D. 二尖瓣狭窄
E. 肥厚型心肌病
[单项选择]What important discovery about seismic waves does the instructor mention
