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【单选题】
已知样本：14、8、10、7、9、7、12、11、13、8、10、10、8、11、10、11、13、9、 12、9，那么样本数据落在范围8.5～11.5内的频率（ ）A.
0.52
B.
0.4
C.
0.25
D.
0.5
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【单选题】. _____ to Beijing, I would visit the Forbidden City where the emperors once lived.
A.
If should I get
B.
If I would get
C.
Should I get
D.
If I get
【简答题】-- I don’t know _______ during the summer vacation. Any advice? -- How about doing some part-time jobs? A. what should I do B. where should I go C. what I should do D. where I should ...
【单选题】What is the correct way to change this question into an indirect question? "Where should I go shopping?"
A.
Can you tell me where I should go shopping?
B.
Do you tell me where I should go shopping?
C.
How can I go shopping?
D.
Can you answer me where can I go shopping?
【简答题】感觉适应: 由于刺激对感受器的持续作用从而使感受性发生变化的现象。
【单选题】听力原文：Where should I put these boxes? (A) There should be three of them. (B) You can set them in the corner. (C) No, but I can put them in a bag for you. (37)
A.
B.
【简答题】一台三相交流电机接于频率为 50 Hz 的电网运转,每相感应电势的有效值 E=350V ,定子绕组的每相串联匝数 N=312 匝,绕组系数 K w =0.96 ,求每极磁通量 Φ(保留两位有效数字) 。
【单选题】听力原文：W：You must enjoy danger，I mean，you wouldn't be a fireman if you didn't，would you? M：I don't know about that．I had a very frightening experience quite recently． Q：What is the man? (17)
A.
He is a safeguard.
B.
He is a fireman.
C.
He is a policeman.
D.
He is a racing-driver.
【单选题】一台三相感应电机接于频率为 Hz的电网,运行转速为735 ,此时转差率为 ,转子电动势的频率为 ,为 运行状态 ( )。
A.
0.02、1Hz、电动机
B.
0.02、50Hz、电动机
C.
-0.02、1Hz、发电机
D.
-0.02、50Hz、发电机
【简答题】蓄电池容量的影响因素有哪些？
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