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问题 问答题 简答题

变压器绝缘老化的“六度法则”是什么？   

答案

参考答案：

当变压器绕组绝缘温度在80℃—130℃范围内，温度每升高6℃，其绝缘老化速度将增加一倍，即绝缘寿命就将低二分之一。

单项选择题 A1/A2型题

下列有关诺卡菌属的临床意义描述错误的是（）

A.广泛分布于土壤中

B.多数为腐物寄生性的非病原菌

C.可产生抗结核杆菌的利福霉素

D.仅感染人类

E.可引起足分枝菌病
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单项选择题

OOP languages that create objects, such as (1) and (2) are beginning to take hold as viable tools for programmers. To effectively reuse objects, programmers need a place to store them such as an ODBMS or a RDBMS with object oriented extensions.
Databases that handle object data not only let user store and retrieve (3) data, but also let them store objects created by OOP languages, to facilitate rapid software development and reuse, and let them (4) new multimedia applications combining multiple data types.
RDBMS vendors have developed new extensions to existing DB technology to accommodate the most common forms of (5) data.

A. C++ B. BASIC C. PASCAL D. C
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