【单选题】以下哪项不属于DES分组密码的流工作模式( )。
【单选题】听力原文:W: Hi, Mike! You missed a great history lecture this morning. Where were you? M: Oh, I overslept again. This really is becoming a bad habit. What did Professor Brown talk about today? W: Can you ...
【单选题】听力原文:W:Hi,Mike! You missed a great history lecture this morning.Where were you? M: Oh, I overslept again. This really is becoming a bad habit. What did Professor Brown talk about today? W: Can you bel...
A.
A student and a professor.
D.
A dentist and a patient.
【判断题】一张好的照片应该主题鲜明、主体突出、背景尽量简洁
【简答题】发动机异响诊断仪主要是根据异响的 、 、 来对发动机异响故障进行诊断。
【单选题】听力原文:W: Hey Taxi! Ah great. Thanks for pulling over. M: Where to? W: Well, I'm going to the National Museum of Art, and... M: Sure. Hop in. No problem. Hang on! W: Uh. Excuse me. How long does it take...
【单选题】听力原文:W: Hey Taxi! Ah great. Thanks for pulling over. M: Where to? W: Well, I'm going to the National Museum of Art, and... M: Sure. Hop in. No problem. Hang on! W: Uh. Excuse me. How long does it take...
【多选题】下列关于燃料油特性及选用的描述正确的有( )。
A.
燃料油分为8个牌号,分别为1号、2号、4号轻、4号、5号轻、5号、6号和7号
B.
轻柴油一般用作小型锅炉的燃料,也常供大型燃煤、燃油锅炉的点火用。
C.
在燃油锅炉运行时,只要保证油蒸气和空气混合物的浓度处在爆炸范围之内,就不会出现爆炸的危险。
D.
燃油1的黏度为5ºE,燃油2的黏度为3ºE,燃油1的流动性好,更方便运输、装卸和燃用
E.
重油按其在50摄氏度时恩式黏度ºE50分为20,60,100和200四个牌号,牌号数即为50摄氏度时的恩式黏度值,也等于80摄氏度时的运动黏度值。
【判断题】平面图形对任一点都有一对主惯性轴,不管点在什么地方。