ISO9000族标准中，质量具有（）性等性质。
A、适用
B、广义
C、相对
D、标准
参考答案：B, C
When seeing a stone in front of the car, _____.
A．the car stopped
B．the car was stopped
C．the driver stopped the car
D．the car was stopping
B．规则的物体的重心在物体上
C．有可能不在物体上
D．不规则的物体的重心不在物体上
