Abstract: Provided are a communication system and a communication apparatus thereof, the communication apparatus includes: a bottom case and a printed circuit board mounted on the bottom case, the communication apparatus further includes a heat-conductive mounting strip, the printed circuit board being mounted on the bottom case by means of the heat-conductive mounting strip, wherein a lower end surface of the heat-conductive mounting strip is connected to the bottom case, and an upper end surface of the heat-conductive mounting strip is connected to the printed circuit board.

Abstract: An adjustable spray head includes a coaxial spray head and an adjusting device. The coaxial spray head includes an outer tube, an inner tube, a needle valve, a gas inlet, and a material inlet. The inner tube is coaxially positioned in the outer tube. One end of the outer tube has an outer exit. The needle valve is coaxially positioned in the inner tube. One end of the inner tube has an inner exit. The top end of the needle valve can be inserted into the inner exit. The adjusting device includes a clamping member, a transmission gear, and a driving motor. The clamping member includes a clamping portion and a teeth bar. The clamping portion clamps the needle valve. The teeth bar is engaged with the transmission gear. The driving motor drives the transmission gear to rotate to drive the clamping member to move linearly.