2、ngClass内置指令的格式是：[ngClass]="{cssClass: expression}"，其中“expression”的类型是（）。A．stringB．numberC．booleanD．any
2、ngClass内置指令的格式是：[ngClass]="{cssClass: expression}"，其中“expression”的类型是（）。
A．string
B．number
C．boolean
D．any
参考答案和解析
groupmod -n grade class
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