当小汽机真空下降至（）kPa，跳闸保护应动作，若保护拒动应不破坏真空紧急停机。
参考答案：-60
关于小儿各期头围的指标，下列哪项是错误的（）
A.出生时平均为34cm
B.6个月时平均为44cm
C.1岁平均为46cm
D.2岁时平均为48cm
E.5岁时平均为54cm
Questions 23-29
Stroke victims sometimes refuse to regard their injured sides as parts of their bodies because ______.
A．they cannot see them in mirrors
B．they can no longer locate sensations there
C．they are unwilling to admit their disabilities
