异常清晰度的定量指标是（）
A.异常下限
B.异常衬度
C.线金属量
D.面金属量
参考答案：B
Mary is a good girl, but she has some___________. For example, she doesn’t like helping others.
A．questions
B．mistakes
C．shortcomings
D．disadvantages
高速百利灌装机生产能力（）包。
