为避免消弧线圈的抽头处于IL＝IC时出现谐振，应满足IL>IC，且IL选得越大越好。
参考答案：错
Tina is an English girl. She is twelve. She is in Class 8, Grade 7. She and I are in the same class. Her telephone number is（010）8256-4325. We are good friends. Her English is good, and she can help me.
根据短文内容判断正（A）误（B）。（10分）
小题1:Tina is from Canada.
小题1:
小题2:Tina is 12.
小题2:
小题3:I’m in Class 7, Grade 8.
小题3:
小题4:My English is good.
小题4:
小题5:Her telephone number is（010）8256—4325.
小题5:
21-三体综合征染色体畸变绝大部分为（）
A.D/G易位型21-三体
B.嵌合型21-三体
C.G/G易位型21-三体
D.标准型21-三体
E.21/22易位型21-三体
