机组启停时，缸胀如何变化？
参考答案：
汽缸的绝对膨胀叫缸胀。在启动过程中，缸胀逐渐增大；停机时，汽轮机各部分金属温度下降，汽缸逐渐收缩，缸胀减小。
As far as I am concerned, education is about learning and the more you learn, _____.[ ]
A. the more for life are you equipped
B. the more equipped for life you are
C. the more for life you are equipped for
D. you are equipped the more for life
关于下列胸科手术麻醉基本要求的描述，错误的是（）
A.消除或减轻纵隔摆动与反常呼吸
B.避免肺内物质的扩散
C.保持PaO2和PaCO2于基本正常水平
D.保持VA/Q于正常水平
E.减轻循环障碍
