反映肺通气功能的较好指标是
A．潮气量B．用力肺活量C．用力呼气量D．通气/血流比值E．肺扩散容量
参考答案：C
Every child is __________, with their own needs, preferences and talents.
A．contradictory
B．similar
C．original
D．Unique
Which figure can describe the attribute of the entity in the E-R graph ( )
A．rectangle
B．quadrilateral
C．rhombus
D．ellipse
