Many things also makeuseful sounds. Drums(鼓) and pianos bring us music. Bells inschool tell us to have classes on time.What is sound? Well, there is sound when an object(物体)vibrates(震动), or moves(移动) back and forth very fast. A vibratingobject makes the air around it move. ...
The ___ can make loud sounds. A. piano B. violin C. harmonica D. pencil 相关知识点: 试题来源: 解析 A。“piano”钢琴可以发出很大的声音。B 选项“violin”小提琴声音相对较小;C 选项“harmonica”口琴声音也不大;D 选项“pencil”铅笔不是音乐器材。反馈...
Which instrument can make very loud sounds? A. The harp B. The trumpet C. The erhu D. The xylophone 相关知识点: 试题来源: 解析 B。本题考查乐器的声音特点。A 选项“the harp”(竖琴)声音较为柔和;C 选项“the erhu”(二胡)声音通常不是很大;D 选项“the xylophone”(木琴)声音清脆但不算很大...
题目All sounds make waves. When you hear your friend's voice, these sound waves go into your (1)e arsand you can identify(识别) your friend's voice. (2)U sually,we cannot see sound waves but we can if we use some simple (3)m aterials. Put a piece of tissue...
"Loud sounds damage your hearing by killing off thousands of little hair cells in the inner ear. The cells detect different pitches of sound through vibration…but they are very fragile and if they vibrate too much due to loud sounds for too long, they get damaged and die." He warned tha...
Most people and animals use sounds to (2)with each other. Many things also make useful sounds. Drums and pianos bring usmusic. Bellsin school tell us to have classes (3)time.What is sound?Well, there(4)sound when an object vibrates, ormoves back and forth very fast. A vibrating ...
Not all sounds are the same.Some sounds are loud. Others are quiet. The loudness of sound is called volume. A human baby's crying is louder than the flying of a bee. The more air that vibrates (振动), the louder the volume is. Sound also can be high or low....
It is only the males who make the noise and the reason they do is unclear - but Ms Cook thinks it might be to help them communicate and locate each other in murky waters. "The fact that it's only males that make sound suggests that it's to do with aggressive behaviour towar...
adieting,however,has its own problems. 节食,然而,有它自己的问题。[translate] aPlease make loud sounds or gently tap the microphone while calibrating for the highest sound level. Starting now. 请做大声的声音或gently轻拍话筒,当校准为最高的声音强度时。 现在开始。[translate]...
The toy trumpet can make loud sounds and the toy flute can make soft sounds. What is different about their sounds? A. One is loud and one is soft. B. Both are loud. C. Both are soft. D. One can sing and one can dance. 相关知识点: 试题来源: 解析 A。玩具喇叭能发出很大的声...