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【简答题】
关系模型的数据操作即是建立在关系上的数据操作，一般有______、增加、删除和修改4种操作。
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反馈参考答案：
举一反三
【单选题】The two drivers were injured in the collision.
A.
hindrance
B.
cry
C.
bombardment
D.
crash
【单选题】Many drivers were praised for their excellent work at the meeting, including two ______ drivers, who had______.
A.
woman; a few white hairs
B.
women's; white hair
C.
woman's; many white hairs
D.
women; some white hairs
【单选题】Two drivers were killed in a head-on ________ down a car and a taxi last night.
A.
collapse
B.
conflict
C.
collision
D.
crush
【单选题】Which statement is true about the car collision?
A.
One driver caused it.
B.
Two drivers were speeding.
C.
The cause is still unknown.
D.
One person was badly hurt.
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