油系统失火需紧急停机时，只允许使用润滑油泵进行停机操作。
参考答案：对
脑瘫按（）可分为痉挛型、不随意运动型、肌张力低下型、共济失调型、强直型、混合型等6个类型。
The last time we had great fun was _____ we were visiting the Water Park. [ ]
A. where
B. how
C. when
D. why
