单项选择题
The lowest temperature required to cause self-sustained combustion of a substance independent of any outside source of ignition is called （）.
A.explosive range B.flash point C.ignition temperature D.combustion temperature
单项选择题 If a refrigeration compressor will not start, the reason may be （）.
单项选择题 Which of the following statements describes the relationship between flash point and ignition temperature?（）
单项选择题 Flexible hose under pressure in a hydraulic system will （）.
