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问题 多项选择题

醋酸AS-D萘酚酯酶(AS-DNAE)染色可呈阳性的有()

A．粒细胞系

B．红细胞系

C．巨核细胞系

D．淋巴细胞系

E．单核细胞系

答案

参考答案：A, B, C, D, E

问答题 简答题

钻机升降段时再执行规章的同时，司机应掌握哪些注意事项？
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单项选择题

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

It is more and more usual that users of Information Retrieval (IR) systems must face up to response of hundreds or thousands of (1) documents. A significant proportion of them are moreover (2) or redundant. This is a straight consequence of two well - known facts: the incessant growing of documental databases and the lack of ability of most users to define (3) information needs. In such a framework, further effective retrieval techniques are only part of the solution. Interfaces with alternative ways for organizing and (4) the results returned by a (5) would be of great utility assisting users to find relevant documents. Document clustering may play a central role as an effective technique for organizing query results.

5（）

A．search engine

B．search tools

C．database

D．computer
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