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【单选题】
下列关于删除数据库的描述,正确的是 _____。A.
数据库一旦创建就不能被删除
B.
在使用 DROP DATABASE 语句删除数据库时，为了避免数据库不存在报错，可加 IF EXISTS 子句
C.
“DROP TABLE”语句是删除数据库的关键字
D.
成功删除数据库后，数据库中的所有数据被清除，但是原来分配的空间仍然会保留
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皮皮学刷刷变学霸
举一反三
【单选题】Would you please _____ to each other before you hand in your examination papers?
A.
not talk
B.
don’t talk
C.
not talking
D.
not to talk
【简答题】指北针符号,圆用细实线绘制,圆的直径正确的是 mm
【多选题】Which of the following statements about the British Empire are True?
A.
It covered almost a quarter of the Earth's total land area.
B.
It was an empire which covered the most area in the history.
C.
Its political,legal,linguistic and cultural legacy is widespread.
D.
It was often described as "the empire on which the sun never sets".
【多选题】Which of the following statements about the British Empire are True?
A.
It ruled about one-fifth of the world's population at its height.
B.
It covered almost a quarter of the Earth's total land area.
C.
Its political,legal,linguistic and cultural legacy is widespread.
D.
It was often described as "the empire on which the sun never sets".
【多选题】Which of the following statements about the British Empire are True?
A.
It ruled about one-fifth of the world's population at the time.
B.
It covered almost a quarter of the Earth's total land area.
C.
Its political,legal,linguistic and cultural legacy is widespread.
D.
It was often described as "the empire on which the sun never sets".
【单选题】去甲肾上腺素对血管作用的结果是
A.
皮肤粘膜血管收缩,内脏、冠脉血管扩张
B.
皮肤粘膜血管扩张,内脏、冠脉血管收缩
C.
皮肤粘膜、内脏血管收缩,冠脉血管扩张
D.
皮肤粘膜、内脏血管收缩,冠脉血管收缩
E.
以上都不是
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