110(66)kV及以上电压等级变压器在出厂和投产前,应用频响法和低电压短路阻抗测试()以留原始记录。
A. 短路阻抗
B. 绕组变形
C. 阻抗电压
D. 负载损耗
查看答案
一般情况下挤压常伴随着剪切同时产生.但挤压应力与切应力是有区别的。
A. 正确
B. 错误
Examine the following command: CREATE TABLE (prod_id number(4), Prod_name varchar2 (20), Category_id number(30), Quantity_on_hand number (3) INVISIBLE); Which three statements are true about using an invisible column in the PRODUCTS table?()
A. The %ROWTYPE attribute declarations in PL/SQL to access a row will not display the invisible column in the output.
B. The DESCRIBE commands in SQL *Plus will not display the invisible column in the output.
C. Referential integrity constraint cannot be set on the invisible column.
D. The invisible column cannot be made visible and can only be marked as unused.
E. A primary key constraint can be added on the invisible column.
建筑施工图可包括()
A. 平面图
B. 立面图
C. 剖面图
D. 大样图
下列各项属于税务行政管理特点的有()。
A. 服务性
B. 法定性
C. 复杂性
D. 时间性