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以云杉采伐迹地的次生演替为例介绍次生演替系列。

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持续性腹痛.血便，肠鸣音减弱或消失，有腹膜刺激征（）

A. 低位性肠梗阻
B. 急性完全性肠梗阻
C. 慢性肠梗阻
D. 绞窄性肠梗阻
E. 动力性肠梗阻

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日常线路维护中高速公路中线路的巡回周期为（）次/月。

A. 2
B. 3
C. 4

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1950年，李达到任后，要求把什么作为湖南大学的校风（）

A. 承朱张之绪，取欧美之长
B. 大学要对各派学术思想均有自由研究
C. 提倡新学术的风气
D. 实事求是，敢为人先

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A customer plans to implement SVC as part of a solution and has concerns regarding the resilience of the SVC architecture. The correct response to this concern is that SVC（）.

A. is stateless with global referencing of metadata
B. is based on cluster architecture with externally provided quorum disks
C. is based on cluster architecture, with quorum held internally on the first cluster node
D. is based on grid architecture, with each node holding a full mirror configuration for all other node

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