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问题 单项选择题

牙再植后，X线片显示牙根炎症性吸收的最早时间是()

A．伤后2～4周

B．伤后1～4个月

C．伤后2～5个月

D．伤后3～6个月

E．伤后1～7个月

答案

参考答案：B

问答题 简答题

目前对我国影响较大的国外现代瘦肉型猪种主要有哪些？
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单项选择题

Applications put computers to practical business (67) , but below the (68) it’s the heart of an operating system-the kernel-that provides the technical wizardry to juggle multiple program, connect to networks and store (69) .
A traditional kernel provides all the functions for applications. The kernel (70) memory, I/0 devices and parcels out processor time.
The kernel also supports security and fault (71) , which is the ability to recover automatically when parts of the system fail.

A．manages

B．manage

C．managed

D．managing
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