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【单选题】
关于单列索引和组合索引的比较,下列说法错误的是( )。A.
只需要单列索引，组合索引完全多余
B.
组合索引仅执行一次检索
C.
如果分别创建两个单列索引，则需要执行两次检索
D.
多列索引比分别创建单列索引的查询效率更高
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Which is ______ of all the subjects?
A.
difficult
B.
the most difficult
C.
more difficult
【单选题】III子宫脱落是指
A.
子宫下降，宫颈外口距处女膜缘<4㎝< /div>
B.
宫颈外口已达处女膜缘
C.
宫颈脱出阴道口外，宫体在阴道内
D.
宫颈及部分宫体已脱出阴道口外
E.
宫颈与宫体全部脱出阴道口外
【简答题】Like a scene out of a reality show or a Disney movie, Southgate, Mich., ager Ashley Qualls' moment has arrived. She may not have an MBA, a high-school diploma, or even a driver’s license yet, but ...
【单选题】—I’d like to make an appointment with Mr. White. —_______
A.
Sorry, he is busy at the moment.
B.
Why didn’t you call earlier?
C.
Certainly. May I know your name?
D.
Sorry. He doesn’t want to see you.
【单选题】The police came in __________ the thief attempted to rush out of the store.
A.
at the moment
B.
the moment
C.
for the moment
D.
at any moment
【单选题】____ the students came into the classroom, they began to study attentively. [ ]
A.
Hardly
B.
The moment
C.
Unless
D.
At the moment
【单选题】Which of the following subjects was not included in those new courses of study?
A.
Theology.
B.
Physics.
C.
International law.
D.
Music.
【简答题】scale with which we are comparing our subjects provides an' effective' or' fair' comparison.
【单选题】42岁妇女,宫颈刮片细胞学检查为巴氏III级,确诊子宫颈癌的可靠方法是
A.
阴道镜检查
B.
腹腔镜检查
C.
宫颈和宫颈管活组织检查
D.
诊断性刮宫
E.
阴道脱落细胞学检查
相关题目：
【单选题】III子宫脱落是指
A.
子宫下降，宫颈外口距处女膜缘<4㎝< /div>
B.
宫颈外口已达处女膜缘
C.
宫颈脱出阴道口外，宫体在阴道内
D.
宫颈及部分宫体已脱出阴道口外
E.
宫颈与宫体全部脱出阴道口外