热塑性塑料在恒定压力作用下，呈坚硬的固体时属于（）。
A. 玻璃态
B. 高弹态
C. 粘流态
D. 液态
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What are the two benefits of graceful restart？（）
A. Graceful restart allows session information recovery without disruption to the network.
B. A node can perform a graceful restart to help a neighbor recover its state. The label bindings are kepton state information， which helps the failed node recover faster and does notaffect the current for wardtraffic.
C. Graceful restart allows a node to recover state from its neighbor when there is no RP or before thedevice undergoes SS
D. Graceful restart does not allow session information recovery.
E. During a graceful restart， the router removes any stale prefixes after a timer for stale entries expire
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