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【判断题】
群中的乘法运算满足ab=ba.A.
正确
B.
错误
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举一反三
【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 ...
A.
sheep's teeth.
B.
cow's teeth.
C.
stone.
D.
wood.
【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.
B.
Two students.
C.
Two dentists.
D.
A dentist and a patient.
【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...
A.
3:40PM.
B.
4:15 PM.
C.
4:30PM.
D.
4:45 下午
【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...
A.
To a park.
B.
To a movie theater.
C.
To a musical.
D.
To a museum.
【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 t...
A.
In less than five minutes.
B.
In less than ten minus.
C.
In less than fifteen minutes.
D.
In less than twenty minutes.
【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。
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