单项选择题

氘灯有486.0nm和656.0nm两条标准谱线，可以用作光谱仪的谱线校准。
A、正确
B、错误

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However, different programming languages have fundamentally different _______ , which are hard to combine.

A． implementations
B． systems
C． memories
D． interpreters

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You have installed two 64G flash devices to support the Database Smart Flash Cache feature on your database server that is running on Oracle Linux.You have set the DB_SMART_FLASH_FILE parameter:DB_FLASH_CACHE_FILE= ‘ dev flash_device_1 ‘,’ dev flash_device_2’How should the DB_FLASH_CACHE_SIZE be configured to use both devices?（）A.Set DB_FLASH_CACHE_SIZE=64GB.Set D3_FLASH_CACHE_SIZE=64G, 64GC.Set D3_FLASK_CACKE_SI2E=128GD.db_flash_cache_SI2E is automatically configured by the instance at startup

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