Để tài : Xây dựng chương trình quan trắc cho làng nghề tái chế bình ắc quy cũ tại Xã Chỉ Đạo, Huyện Văn Lâm, Tỉnh Hưng Yên - Xác định phương án quan trắc
- Quy chuẩn tiêu chuẩn sử dụng để đánh giá
- Xác định thông số môi trường cần quan trắc
- Xác định vị trí , tần suất và thời điểm lấy mẫu
mn giúp em tìm 4 ý này vs ạ

Most leaks in reciprocating air compressors can be detected and minimized by: (clo4) a)-detecting leakage areas using ultrasonic acoustic detector. b)-tightening joints and connections c)-replacing faulty equipment d)-all of the given options

Derive the correction factor formula for conical nozzle i=-(1+ cosa) and calculate the nozzle angle correction factor for a nozzle whose divergence hal-fangle is 13 (hint: assume that all the mass flow originates at the apex of the cone.

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.