单项选择题

若复杂电路的节点数为n,支路数为m,则可列出独立的节点电流方程个;独立的回路电压方程____个 (5.0分)

A．n:m-1
B．n;m-n
C．n-1;m-n-1
D．n-1;m-n+1

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单项选择题

You are managing an Oracle Database 11g databasE.You want to take a backup on tape drives of the USERS tablespace that has a single data file of 900 MB.You have tape drives of 300 MB each. To accomplish the backup, you issued the following RMAN command:RMAN> BACKUPSECTION SIZE 300M TABLESPACE users;Identify the appropriate configuration to accomplish faster and optimized backups using the above commanD.（）A.The SBT channel must be configured, with the MAXPIECESIZE set to 300 mB.B.The SBT channel must be configured, with the parallelism setting for the SBT devices set to 3.C.The COMPATIBLE initialization parameter for the database instance must be set to at least 10.0.D.The SBT channel must be configured, with the default parallelism setting for the SBT devices set to 1

A.（）
A.B.
C.
D.0.

多项选择题

科学史上，很多科学家因为这样那样的原因都曾因自己的权威二阻碍过科学的发展。比较有名的例子有（）。

A．亚里士多德断言：物体下降的速度与其重量成正比。
B．爱因斯坦反对量子力学和测不准原理。
C．卢瑟福断言院子释放能量是不可能的。
D．爱迪生认为交流电太危险。

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