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- How much does sound travel faster in water than in air? 聲音在水中比在空氣中傳播快多少？
- The speed of sound in water is about four as great as in air. 聲音在水中的速度是空氣中的四倍左右
- Secondary Surveillance radar (SSR) is a key equipment in Air Traffic Control (ATC) and military Identification Friend or Foe (IFF). Since very high reliability and stability is required in these two areas, SSR is a hot issue in Radar signal processing. 二次雷達(Secondary Surveillance Radar)是民航空中管制(Air Traffic Control)和軍事敵我識別(Identification Friend or Foe)系統中的關(guān)鍵部分,由于這兩個(gè)應用領(lǐng)域都要求很高的可靠性和穩定性,因此,二次雷達一直是國內外雷達信號處理領(lǐng)域的研究熱點(diǎn)。
- He sucked in air, then went under the water again. 他深深吸了一口氣又潛到水里。
- Sound travels better in water than in air. 聲音在水中比在空氣中傳播得快。
- Sound travels at 1, 100 feet per second in air. 聲音在空氣中的傳播速度為每秒鐘1,100英尺。
- Designed to operate on land, water, or in air. 長(cháng)于陸?？兆鲬鸬?，三棲的可在陸上、水上或空中操作的
- SHANGHAI ZHIYIN SOUND EQUIPMENT CO., LTD. 上海知音音響器材有限公司。
- Guangzhou Hengxin Sound Equipment Co. 廣州恒欣音響器材商行。
- Shanghai Nissei Sound Equipment Co., Ltd. 上海日生音響設備有限公司。
- Exhaust gas has been incriminated in air pollution in cities. 廢氣已過(guò)視為城市空氣污染的原因。
- Service equipment in existing accounts. 為現有的客戶(hù)提供技術(shù)服務(wù)。
- The velocity of sound in water is more than four times that in air. 聲音在水中的速度是在空氣中的速度的4倍多。
- Call up the equipment in change mode. 在修改方式下,調用設備主記錄。
- She crawled onto the river bank and lay there gulping in air. 她爬上河岸,躺在那里喘著(zhù)大氣。
- The list of the equipment in duplicate. 設備清單一式二份。
- How much does sound travel faster in water than in air ? 聲音在水中比在空氣中傳播快多少?
- The camper had cooking equipment in his pack. 那露營(yíng)者的背包里有烹飪裝備。
- They packed the food and camping equipment in the trailer. 他們把食物和野營(yíng)用具都裝上拖車(chē)上了。
- In water sound travels nearly five times as fast as in air. 聲音在水中的傳播速度幾乎是在空氣中傳播速度的五倍。
