单项选择题 The degree to which the viscosity of an oil will change with a change in temperature is indicated by the （）.

单项选择题 The heat required to change a substance from a solid to a liquid while at its freezing temperature, is known as the latent heat of （）.

单项选择题 With reference to a vessel’s structural integrity, the most significant characteristic of a cryogenic liquid is its （）.