正线轨行区施工范围内，同一施工计划原则上最多允许存在（）个作业点。
A.2
B.3
C.4
D.5
参考答案：D
I could tell he was surprised from the ________ on his face.
A．appearance
B．view
C．sight
D．expression
你认为在评价股份有限公司的盈利能力时，哪个财务指标应当作为核心指标？为什么？
