卧式车床有哪些主要部件组成的？
参考答案：
卧式车床由床身、主轴箱、溜板箱及滑板、刀架、进给箱、挂轮箱及尾座6大部分组成.
火场上扑救原则是先人后物、先重点后一般、先控制后消灭。
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.
A. keepB. keeped C. keeping D. kept
