所配断路器采用（）的自能式灭弧原理。
A.去离子栅式
B.热膨胀+助吹
C.纵吹
D.横吹
参考答案：B
Though great efforts have been ________on her study,Annie can’t still make any improvements,which makes her parents greatly________.
A．made;surprised
B．done;surprising
C．taken;surprised
D．given;surprising
积蓄中毒
