房屋租赁实际上是房屋( )的一种特殊形式。它是通过房屋出租实现房屋价值,从而使出租人得到收益回报的一种房屋交易形式。
A.流通
B.转让
C.抵押
D.创利
参考答案:A
收音机的音量控制电路部分如图所示,调节滑动变阻器的滑臂P,可控制扬声器的音量,但收音机直接收到的信号有干扰,即有直流和高频信号,为此需要用电容器C1、C2滤去直流和高频部分.根据电容器容抗的性质,试确定C1、C2应分别用较大的还是较小的电容器.
In a public-key cryptosystem, (71) encrypted with the public key can only be deciphered with the private key from the same (72) . Conversely, (71) encrypted with the private key can be decrypted only with the public key. Users can make their public keys (73) available or place them at a key distribution center or others to access. However, the private key must be (74) safe. In public-key systems there’s no (75) to find a safe channel for communicating a shared secret key.
(75)是()
A.more
B.necessary
C.need
D.space