A:这种超声波具有能量
B:这种声波的强度是145dB
C:声波定向发射器喇叭状外观可以减少声音的分散,从而增大响度
D:使用“金嗓子”时,护航官兵佩戴耳罩是在人耳处减弱噪声
根据汉语提示完成句子(1)He ____ (坚持) that she was the perfect girl to play the lead role in the play. (2) What about going to the concert with me tonight? Sounds good. But I don't feel well. I prefer to stay at home ____ (代替) of staying out.(3)We are sure you will become famous____ (立即) if you successfully host the show.(4)Bill Gates and some others promised to ____ (奉献) much of their money to Charity.(5) Why was the young man arrested? He was charged of ____ (强行闯入) into the bank's computer systems and stealing important information.(6)Tom got along with all his neighbors ____ (除了) the man who looked strong. (7)Has the man ____ (证明) that he was at another place when the accident happened?(8)Was he out of ____ (呼吸) after running for a quarter around the playground?(9)The victim obviously put up a good fight against the ____ (冷酷的) murderer.
不属于战国七雄的( )
关于处方药与非处方药的叙述不正确的是()
抛物线y2=4x的准线与双曲线 x2a2-y2=1a>0交于A,B两点,点F为抛物线的焦点,若△FAB为直角三角形,则双曲线的离心率为( )
健康人每天形成的原尿约有180升,而每天排出的尿却只要1.5升左右,这是什么原因呢? ____