Ry-Qz Well, so we have to take the first component, Ry minus Qz, and take its partial with respect to x.
首先考虑第一个分量，求出它关于x的偏导数。
QZ company is an enterprise being mainly engaged in the Fettling and Trimming Equipments products.
QZ公司是一家生产清理设备为主的企业。
QZ type general overhead crane, grab crane for coal cinder handing, garbage handing.
QZ型-通用桥式起重机，抓斗天车，抓斗行车，抓斗起重机，煤渣抓用起重机，垃圾专用起重机。
The main products are: JP Series winch irrigation system, the transfer of irrigation system, PYC series of vertical rocker-type nozzle, QZ, QH, QSZ, QSH series axis (mixed)-flow submersible pump.
主要产品有：JP系列绞盘式喷灌机、移管式喷灌机、PYC系列垂直摇臂式喷头、QZ、QH、QSZ、QSH型系列轴（混）流式潜水电泵。
The main products are: JP Series winch irrigation system, the transfer of irrigation system, PYC series of vertical rocker-type nozzle, QZ, QH, QSZ, QSH series axis (mixed)-flow submersible pump.
主要产品有：JP系列绞盘式喷灌机、移管式喷灌机、PYC系列垂直摇臂式喷头、QZ、QH、QSZ、QSH型系列轴（混）流式潜水电泵。
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