按我国法定计量单位使用方法规定2dm3应读成（）。
A. 2分米立方
B. 2立方分米
C. 立方2分米
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工业与民用建筑高压配电所的母线，通常采用（）。
A. 无母线
B. 单母线制
C. 双母线制
D. 带旁路母线制
拜仁的哪名球员创造了欧冠赛场上10.2秒的最快进球记录（）
A. 巴拉克
B. 马凯
C. 里贝里
D. 盖德穆勒
Which two statements about the DiffServ model are true？（）
A. a class can be identified as a single application， multiple applications with similar service needs，or be based on the source or destination IP address
B. a drawback of the DiffServ field in the MAC header to mark frames into behavior aggregates （BAs）
C. DiffServ uses the DiffServ field in the MAC header to mark frames into behavior
D. the DiffServ field occupies the same eight bits of the MAC header that were previously used for the ToS field
E. the first six high-order bits of the DiffServ field are used to identify the Resource Reservation Protocol （RSVP） value
F. the primary goal of DiffServ is scalability
水泵运行中，开关红灯不亮（灯泡不坏），该泵可能停不下来。
A. 正确
B. 错误
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