摇表在测量中，摇把的转速由慢至快，一般应保持在每分钟（）转左右。
A、80
B、120
C、160
参考答案：B
Mr. Green, for _____ life had been very hard, donated his possessions to earthquake-hit families in Sichuan.
A. whose B. whom B. which D. that
高周波电疗仪的火花治疗操作要点有哪些？
