节理按力学性质分为下列哪几种?Ⅰ.构造节理Ⅱ.原生节理Ⅲ.风化节理Ⅳ.剪节理Ⅴ.张节理()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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