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【单选题】
下列关于直流电动机说法错误的是 ( )。A.
串励电动机不允许空载或轻载运行
B.
并励电动机不允许励磁回路开路
C.
同时改变直流电动机的励磁及电枢电流方向可改变其转向
D.
降低他励电动机电枢端电压，其转速下降
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【单选题】Da Vinci was the first robotic system to be applied and approved by the Food and Drug Administration.
A.
Y
B.
N
C.
NG
【单选题】The insect population increased due to ______.
A.
the hot air
B.
the tropical climate
C.
the rain clouds
D.
the damp atmosphere
【单选题】What is Mr. Porter's profession?
A.
Director of Human Resources
B.
Detective
C.
Accountant
D.
Administrative Assistant
【单选题】What do we learn about business schools in the last paragraph?
A.
They are reluctant to admit to failing
B.
They resent criticism of their academic journal
C.
They used to be looked down on by other institution
D.
They are comfortable with the current situatio
【简答题】听对话，回答问题。 1. What was the weather like that day? A. Pretty cold. B. Rather hot. C. Heavily rainy. 2. Who gave the old man something when they first met? A. Her son. B. Her husband. C. Her father. 3. W...
【简答题】LTE中，______类似RAI+P-TMSI;_______类似2G/3G位置区LAI或路由区RAI，由____、____和____组成，寻呼时按照_____进行寻呼。
【单选题】对于路由区编码RAI，下列哪个描述是正确的：（）
A.
RAI=MCC+MNC+LAC；
B.
RAI=MCC+MNC+LAI；
C.
RAI=MCC+MNC+RAC；
D.
RAI=MCC+MNC+LAC+RAC。
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