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【单选题】
The carrier shall not be liable for the loss of or damage to the goods occurred during the period of carrier's responsibility arising or resulting from any of the following causes except ______.
A.
Fire,unless caused by the actual fault of the carrier
B.
Force majeure and perils,dangers and accidents of the sea or other navigable waters
C.
War or armed conflict
D.
Intentional misconducts by the crew members on board the ship against the carrier
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举一反三
【单选题】Why is Tambora mentioned in this clip?
A.
To remember the people wh died in that event.
B.
To show how powerful volcanoes are.
C.
To warn people to stay away from Tambora.
D.
To show how weak people were at that time.
【单选题】Why is Tambora mentioned in this clip?
A.
To remember the people who died in that event.
B.
To warn people to stay away from Tambora.
C.
To show how powerful volcanoes are.
D.
To show how weak people were at that time.
【单选题】下列选项中不属于天然保护点的是( )。
A.
山里的大树
B.
大石头
C.
木桩
D.
山体
【单选题】实体完整性要求主属性不能取空值,这一点可以通过( )来保证。
A.
定义外码
B.
定义主码
C.
用户定义的完整性
D.
由关系系统自动
【单选题】关系数据模型中用来保证实体完整性的是______。
A.
任一属性
B.
多个属性集
C.
主关键字
D.
外部关键字
【单选题】实体完整性要求主属性不能取空值,这通常是通过( )。
A.
定义外部键来保证
B.
用户定义的完整性来保证
C.
定义主键来保证
D.
关系系统自动保证
【单选题】实体完整性规则要求主属性不能取空值,为此,可通过______来保证。
A.
定义主关键词
B.
用户定义的完整性
C.
定义外部键
D.
关系系统自动定义
【简答题】词形变化。 1. Why not go _________(boat) on the river with me? 2. The children like _______( swim) in the lake. 3. Do you enjoy _______(teach) English in our class, Mr. Green? 4. Are you ______(go)______(h...
【单选题】实体完整性要求主属性不能取空值,这一点通常是通过( )。
A.
定义外部键来保证
B.
定义主键来保证
C.
用户定义的完整性来保证
D.
关系系统自动保证
【单选题】用来保证实体完整性的是
A.
外部关键字
B.
主关键字
C.
实体属性
D.
以上都可以
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