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【单选题】
下列关于触发器优点的描述,错误的是( )A.
触发器是自动执行的
B.
触发器可以实现对数据库中的相关表的级联更改
C.
强化完整性约束
D.
提高数据的检索速度
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】As the director can't come to the reception, I'm representing the company __________.
A.
on his account
B.
on his behalf
C.
for his part
D.
in his interest
【单选题】--------- Come and join us, Jim! ---------- I’m sorry I can’t . If I _______ time, I would certainly go.
A.
will have
B.
have had
C.
had
D.
had had
【单选题】——Can you come and play basketball with us? ——______ .
A.
Sorry, I can't. I have to finish my homework first
B.
No, I am not. I'm very busy now
C.
Yes, I do. I like it very much
【简答题】Thank you very much for your _________(invite). But I’m so sorry that I can’t come to your party tomorrow.
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