硅烷的“偶联作用”机理决定于X3SiY结构中的有机官能团Y和可水解基团X之间的稳定联接。硅原子上可可以引入的水解基团X有:( ) 。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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