患者有轻微系统性疾病，重要器官有轻度病变，但代偿功能健全，急症需手术。ASA分级为（）
A．2C
B．2E
C．2D
D．3C
E．3E
参考答案：B
Although the used car seems in good _____, it cannot run too fast.
[ ]
A. state
B. situation
C. condition
D. occasion
系统工程方法论
