纯金属与它的固溶体的塑性最好，而化合物的塑性较差。
A. 正确
B. 错误
净料是组成单位产品的直接用料，其成本直接构成产品的成本。
A. 正确
B. 错误
In your database， you may be forced to perform a recovery using the RESETLOGS option during which the redo logs would be reset to sequence number 1. You want to avoid the overwriting of old log files. Which archived log file name format ensures this？ （）
A. %t_%s.dbf
B. arch_%t.arc
C. arch_%d.arc
D. arch_%t_%d.arc
E. arch_%d_%s_.dbf
F. arch_%t_%s_%r.arc
Overlay Transport Virtualization （OTV） overlay interface is a logical multiaccess and multicast- capable interface that must be explicitly defined by the user and where the entire OTV configuration is applied. Which statements are true about OTV overlay interface？（）
A. When an OTV edge device receives a Layer 2 frame destined for a remote data center site， the frame is logically forwarded to the overlay interface.
B. The OTV edge device performs the dynamic OTV encapsulation on the Layer 2 packet and sends it to the join interface toward the routed domain.
C. When the OTV edge device receives a Layer 2 frame destined for a remote data center site， the frame is logically forwarded to the join interface.
D. The OTV edge device performs the dynamic OTV encapsulation on the Layer 2 packet and sends it to the overlay interface toward the routed domain.
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