温度对润滑效果的影响主要是（）。
A、使润滑脂失效
B、引起润滑脂变质
C、引起润滑脂粘度变化
D、以上均正确
参考答案：C
I have been told hundreds of times ________ the light with wet hands. [ ]
A. not to turn into
B. to not turn into
C. not to turn on
D. to not turn on
纵联保护的通道可分为几种类型？
