They were surrounded by the enemy, but t

运输铁的蛋白质为（）

A.清蛋白

B.转铁蛋白

C.铁蛋白

D.铜蓝蛋白

E.血红蛋白

维生素A缺乏，在犬和犊牛称（）

A.渗出综合征

B.干眼病

C.劈叉姿势

D.趾爪蜷曲症

E.观星症

在国际货物众多运输方式中，运用最广泛的运输方式是（）。

A．国际铁路联运

B．航空运输

C．海洋运输

D．邮包运输

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. length B. pair C. sizeD. space