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【简答题】
一台单相变压器, S N =100 kVA , U 1N /U 2N =6000/230 V ,变比K=26.1, R 1 =4.32Ω , x 1 =8.9Ω , R 2 =0.0063Ω , x 2 =0.013Ω 。则 折算到高压侧的短路参数 = 、 = 、 = ; 以高压侧的 阻抗为 基准 阻抗,则短路参数的标值分别为 = 、 = 、 = ;。 折算到低压侧的短路参数 = 、 = 、 = ; 以 低压侧 的阻抗为基准阻抗,则短路参数的标值分别为 = 、 = 、 = ; 变压器的短路电压 u k = % , 短路电压 有功分量 % 、 短路电压 无功分量 % ; (注:保留小数点后三位) 求 在额定负载下,功率因数分别为 、 (滞后)、 (超前) 3 种情况下的 △U %分别为 % 、 % 、 % 。 (注:保留小数点后两位)
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【简答题】Suppose users share a 2 Mbps link. Also suppose each user transmits continuously at 1 Mbps when transmitting, but each user transmits only 20 percent of the time. (See the discussion of statistical mu...
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A.
You obtain the results retrieved from the public synonym HR created by the database administrator.
B.
You obtain the results retrieved from the HR table that belongs to your schema.
C.
You get an error message because you cannot retrieve from a table that has the same name as a public synonym.
D.
You obtain the results retrieved from both the public synonym HR and the HR table that belongs to your schema, as a Cartesian product.
E.
You obtain the results retrieved from both the public synonym HR and the HR table that belongs to your schema, as a FULL JOIN.
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【简答题】Suppose users share a 2 Mbps link. Also suppose each user transmits continuosly at 1 Mbps when transmitting, but each user transmits only 20 percent of the time. (See the discussion of statistical mul...
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【简答题】( )是在网络层上实现多个网络互连的设备,它可以实现不同高层协议间的转换。
【单选题】The database administrator of your company created a public synonym called HR for the HUMAN_RESOURCES table of the GENERAL schema, because many users frequently use this table. As a user of the databa...
A.
You obtain the results retrieved from the public synonym HR created by the database administrator.
B.
You obtain the results retrieved from the HR table that belongs to your schema.
C.
You get an error message because you cannot retrieve from a table that has the same name as a public synonym.
D.
You obtain the results retrieved from both the public synonym HR and the HR table that belongs to your schema, as a Cartesian product.
E.
You obtain the results retrieved from both the public synonym HR and the HR table that belongs to your schema, as a FULL JOIN.
【简答题】在网络层上实现多个网络互连的设备是( )
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