计算机执行指令的过程是：在控制器的指挥下，把 (12) 的内容经过地址总线送入 (1

In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. There are two types of key technology: private key and public key. Private - key encryption methods are called (66) ciphers, information is encrypted with (67) both the sender and receiver hold privately. Public - key encryption methods are called (68) ciphers, (69) created for each user, encryption key and decryption key ale (70) .

A．synchronous

B．Asynchronous

C．symmetric

D．asymmetric

0是△ABC的内心，∠A=80°，则∠BOC的度数是（　　）

A．160°

B．130°

C．100°

D．40°

所有的偶数都是合数．______．

轧制速度就是与金属接触处的轧辊的圆周速度。关于轧制速度，下列说法中正确的有（）。

A、轧制速度越高，轧机产量就越高

B、轧制速度受电机能力、坯料状态、机械化与自动化水平等因素的限制

C、轧制速度与变形速度具有一致性

D、轧制速度对咬入有一定的影响

E、轧制速度对咬入无影响

痢疾杆菌的致病性主要取决于（）

A.外毒素

B.内毒素

C.能对抗肠黏膜局部免疫力，分泌性IgA

D.对肠黏膜上皮细胞具有侵袭力

E.有对抗肠黏膜正常菌群的能力