【多选题】关于电压互感器的准确度,描述正确的包括()
A.
电压互感器的准确度等级是指在规定的一次电压和二次负荷变化范围内,负荷功率因数为额定值时,误差的最大限值
B.
通常电力系统用的有0.2,0.5,1,3,3P,4P级等
【单选题】In what way is the market very real for each person or business who is making and selling something?
A.
It tells you what to produce.
B.
It tells you how to grow vegetables.
C.
It offers you everything you need.
D.
It offers you everything you need.
【单选题】In what way is the market very real for each person or business who is making and selling something?
A.
It tells you what to produce.
B.
It tells you how to grow vegetables.
C.
It offers you everything you need.
D.
Ii helps you save money.
【单选题】标注水平尺寸时,尺寸数字应放在尺寸线的( )
【单选题】下列关于表面结构说法错误的是( )。
A.
表面结构的注写和读取方法与尺寸的注写和读取方向一致
【判断题】仔猪喜欢吃甜食、喜欢吃颗粒料,但不喜欢抢着吃。