测量器具对被测量变化的反应能力，即仪器指示变量与其相应的被测量之比称( )，也称放大比。
A．测量精度
B．测量误差
C．灵敏度
参考答案：C
— Did you see the beginning of the film?
— No. It ________ for 20 minutes when I got to the cinema. [ ]
A. has been on
B. had been on
C. had begun
D. has begun
( )可以进行社交技巧、自信心的训练、新角色的适应等。
A．拓展性小组
B．发展性小组
C．治疗性小组
D．支持性小组
E．预防性小组
