Engine : Engineering Safety - 1003/968
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| What is the purpose of depressing the button on the handle of a sound-powered telephone handset? |
| A) The button must be depressed to speak and to listen. |
| B) The button is depressed to ring the remote station. |
| C) The button must be depressed to listen, but not to speak. |
| D) The button must be depressed in order to speak, but not to listen. |
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