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【判断题】
中国东方航空集团是中国三大国有大型骨干航空企业集团。 ( )
A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】UPS逆变器输出的SPWN波形,经过输出变压器和输出滤波电路将变换成()
A.
方波
B.
正弦波
C.
电压
D.
电流
【单选题】Employees who spend at least some (but not all) of their time working remotely have higher engagement than those who don't ever work remotely.
A.
She has broken off her engagement to Charles.
B.
He was known for his engagement with the problems of the most difficult students.
C.
The governor has numerous speaking engagements .
【判断题】“先救人、后防险” 是安全排险救灾的基本原则。
A.
正确
B.
错误
【单选题】(单选)颗粒在流体中做沉降运动时,阻力系数:
A.
仅与颗粒雷诺数有关
B.
仅与颗粒球形系数有关
C.
与颗粒雷诺数和球形系数都有关
D.
与颗粒雷诺数和球形系数都无关
【单选题】engagement Employees who spend at least some (but not all) of their time working remotely have higher engagement than those who don't ever work remotely.
A.
She has broken off her engagement to Charles.
B.
He was known for his engagement with the problems of the most difficult students.
C.
The governor has numerous speaking engagements .
【判断题】“先防险、后救人” 是安全排险救灾的基本原则。
A.
正确
B.
错误
【单选题】冠心病患者出院后最常用的锻炼方法是
A.
跳绳
B.
行走
C.
游泳
D.
骑自行车
E.
打球
【单选题】哪个选项里的engagement和原句里是一样的意思? Employees who spend at least some (but not all) of their time working remotely have higher engagement than those who don't ever work remotely.
A.
She has broken off her engagement to Charles.
B.
He was known for his engagement with the problems of the most difficult students.
C.
The governor has numerous speaking engagements .
【单选题】颗粒在流体中做沉降运动时,阻力系数()
A.
仅与颗粒雷诺数有关
B.
仅与颗粒球形系数有关
C.
与颗粒雷诺数和球形系数都有关
D.
与颗粒雷诺数和球形系数都无关
【单选题】在单相桥式整流电路中,设变压器次级的交流电压有效值为10V,则负载上的直流平均电压为()V。
A.
10
B.
0.1
C.
9
D.
-10
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