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【简答题】
he said that his mum had been sick and unable to take him to piano lessons, but he ________(practise).
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【多选题】OSPF routing uses the concept of areas. What are the characteristics of OSPF areas? （）
A.
Each OSPF area requires a loopback interface to be configured.
B.
Areas may be assigned any number from 0 to 65535.
C.
Area 0 is called the backbone area.
D.
Hierarchical OSPF networks do not require multiple areas.
E.
Multiple OSPF areas must connect to area 0.
F.
Single area OSPF networks must be configured in area 1.
【简答题】写出下列牌号数字及文字的含意，Q235-F、KTZ450-06、H68、LF5。 例如：HT100：表示灰铸铁，其最低抗拉强度为100MPa。
【简答题】What is reference? What is concept? What is sense? What is motivation? What are the four types of motivation?
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