变压器的绝缘是指绕组对（）和绕组对（）之间的绝缘。
参考答案：地、绕组
商品的价值量与劳动生产率成反比。[ ]
Questions 1-4
What is the relationship between the man and the woman？（）
A．They are friendly neighbors.
B．They are company colleagues.
C．They are husband and wife.
D．They are guide and tourist.
