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短路回路的电压和阻抗相同的情况下，三相短路电流和两相短路电流哪个大？

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世界上第一颗人造卫星在科罗廖夫的领导下研制成功。

A. 正确
B. 错误

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农业机器的设计与制造是农业机械化的基本内容之一。

A. 正确
B. 错误

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手工填制的会计凭证应（）、（）、手续完备、（）、数字准确、字迹清晰。

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Your SPFILE contains the following parameter settings： SGA_TARGET = 8G DB_CACHE_SIZE = 4G SHARED_POOL_SIZE = 2G LARGE_POOL_SIZE = 512M JAVA_POOL_SIZE = 512M LOG_BUFFER = 100M SGA_MAX_SIZE = 10G You query the V$SGA_DYNAMIC_COMPONENTS dynamic performance view and discover that the large pool component is currently sized at 1G. You want the value of the SGA_TARGET initialization parameter to 10G， but instead of specifying a value of 10G for the SGA_TARGET initialization parameter， you erroneously execute the following statement： SQL>ALTER SYSTEM SET SGA_TARGET = 0 SCOPE = BOTH； What is the result of this statement？（）

A. The database crashes.
B. The large pool releases 512M of memory.
C. The large pool retains 1G of allocated memory.
D. The large pool increases to 1，512M of memory.

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