manned spacecraft launch造句

例句与造句

1. A whisper is about 30 dB, conversation is about 80 dB, shouting is about 100 dB, loud thunder or a rock band hits about 130 dB, the pain threshold is about 150 dB, and a manned spacecraft launch ( think the Saturn V moon rocket ) from 150 feet is about 180 dB . There does not appear to be a requirement that noise be sinusoidal to have a dB reading.
2. It's difficult to find manned spacecraft launch in a sentence. 用manned spacecraft launch造句挺难的