()是指消声器进口端入射声的声功率级与消声器出口端投射声的声功率级之差。
参考答案:传递损失
27、请给下面短文中的画线句子断句。(3分)
宋有狙公者,爱狙。养之成群能解狙之意狙亦能得公之心损其家口,充狙之欲。俄而匮焉,将限其食。恐众狙之不驯于己也,先诳之曰:“与若芧,朝三暮四,足乎?”众狙皆起而怒。俄而曰:“与若芧,朝四而暮三,足乎?”众狙皆伏而喜。
小题1: 多数人统治,人头都算数;少数人统治,人头就落地。
Under m rule, heads are counted; under minority(少数) rule, heads are cracked.
小题2: 愚者的心长在嘴里,智者的嘴藏在心里。
The heart of a fool is in his mouth but the mouth of a wise man is in his h .
小题3: 快活的人通常都是傻瓜。
A m man is usually a fool.
小题4: 趁热打铁。
S the iron while it is hot.
小题5: 麻烦不找你,别去找麻烦。
Never trouble trouble until t troubles you.
小题6: 不要以从别人那里借来的观点为生。
Don’l on the borrowed opinions of other men .
小题7: 幸运和不幸是邻居。
F and misfortune are next-door neighbors.
小题8:世界是一出戏,要是事先知道情节,就不值得看了。
The world is a play that would not be worth seeing if we knew the p .
小题9:患难见真情。
A friend in n is a friend indeed.
小题10: 工欲善其事,必先利其器。
A craftsman who wishes to do his work well must first s his tools.