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操作挖掘机稳和准的一般要求是什么？

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冻结存款、汇款应当由法律或行政法规规定的行政机关实施。

A. 正确
B. 错误

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能够自动防止管内介质倒流的闸门叫（）。

A. 止回阀
B. 节流阀
C. 切断阀
D. 蝶阀

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Which two statements about Oracle Direct Network File System (NFS) are true?（）

A. It bypasses the OS file system cache.
B. A separate NFS interface is required for use across Linux, UNIX, and Windows platforms.
C. It uses the operating system kernel NFS layer for user tasks and network communication modules.
D. File systems need not be mounted by the kernel NFS system when being served through Direct NF
E. Oracle Disk Manager can manage NFS on its own, without using the operating system kernel NFS driver.

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在建立对象模型时，要经历哪些抽象思维过程？

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