Abstract: The disclosure discloses a condensing heat exchanger and a water heating/heating device thereof. The condensing heat exchanger includes: a housing including a first end portion and a second end portion opposite to each other, and a side wall arranged between the first end portion and the second end portion, the second end portion being provided with a mounting portion for mounting a combustor; a smoke outlet arranged on the housing; a heat exchange component arranged inside the housing; and a first heat insulating member arranged close to the first end portion. A first gap is provided between the first heat insulating member and the first end portion, and at least part of smoke which has exchanged heat with the heat exchange component can flow through the first gap and be discharged from the smoke outlet.

Abstract: The present disclosure relates to a method and a device for controlling information transmission and a smart terminal. The method includes: receiving an instruction for outputting information sent by a near field communication (NFC) chip, an information output function of the NFC chip being in a disabled state and information to be outputted being in an unavailable state; performing authentication of an identity of a user who triggers the information output; and if it is determined that the authentication of the identity is passed, enabling the information output function of the NFC chip and setting the information to be outputted as in an available state, such that the NFC chip can output the information. In the present disclosure, the information transmission through NFC can be more safe and reliable.

Abstract: The present disclosure relates to a method and a device for controlling information transmission and a smart terminal. The method includes: receiving an instruction for outputting information sent by a near field communication (NFC) chip, an information output function of the NFC chip being in a disabled state and information to be outputted being in an unavailable state; performing authentication of an identity of a user who triggers the information output; and if it is determined that the authentication of the identity is passed, enabling the information output function of the NFC chip and setting the information to be outputted as in an available state, such that the NFC chip can output the information. In the present disclosure, the information transmission through NFC can be more safe and reliable.