The Qt QML Core module provides core system functionality in QML.
可以使用以下 import 语句在 .qml 文件中把 QML 类型导入应用程序：
import QtCore
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Access to the user's Bluetooth peripherals |
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Access to the user's calendar |
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Access to the user's camera |
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Access to the user's contacts |
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Access to the user's location |
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Access to the user's microphone |
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Provides persistent platform-independent application settings |
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Provides access to the standard system paths |
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Provides information about the system |
