根据Jim’s Family Tree，在横线上填入正确的单词。

Jim’s Family Tree

　　I  71 a friend.   72 name is Jim. There are(有) eight(八个) people(人) in his  73 .

His grandparents have two sons, his father and his  74 . His parents have two  75 and two  76 .   77    78 Jim, Susan, Henry and Jane. So Jim has two  79 and a  80 . Jim loves his family very much. They love him, too. He has a big and good family.

钳形电流表的使用应注意在测量前先估计被测量电流的大小选用合适的量程，不可在测量过程中（）。