输出属性是一个指令属性，可作为事件绑定的目标。
A directive property that can be the target of event binding.
如果下列指令的目标是一个分支，这个目标的计划可能会崩溃。
If the following instruction is the target of a branch, the target program may crash.
EEC指令规定的安全目标应适用于机械。
Thee safety objectives set out in Directive 73/23/EEC shall apply to machinery.
EEC指令规定的安全目标应适用于机械。
Thee safety objectives set out in Directive 73/23/EEC shall apply to machinery.
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