感应式仪表由（）等组成。
A、固定的开口电磁铁
B、永久磁铁
C、可转动铝盘及转轴
D、计数器
E、机械调零机构
参考答案：A, B, C, D
They tried several times to _______ the problem, and in the end they succeeded.[ ]
A. give up
B. work out
C. look through
D. think of
儿童坐高占身高的百分比随年龄的增长而逐渐上升。()
