信阳市平桥区是农业大区,耕地面积8.8万hm2,其中水稻面积3.73万hm2,小麦面积3.67万hm2,油菜面积1.07万hm2,玉米面积0.8万hm2,花生面积2万hm2,蔬菜面积0.8万hm2,连续多年被农业部确定
In order to promote the tolerance and controllability of the multi-degree-of-freedom(M-DOF) ultrasonic motor, a novel two-degree-of-freedom(2-DOF) spherical ult
春光区块近年来逐渐发现了一系列绝对电阻率低值油藏,其电阻率一般为1~3Ω·m。研究认为其受沉积背景、构造成藏等宏观上的控制,结合成岩作用下储层自身的微观岩石物理机
To realize numerical simulation of rolling and obtain the hot forming process parameters for X70 HD steel, the flow stress behaviors of X70 HD steel were invest
辽河滩海西部凹陷沙一、二段对应一个完整的三级层序,可划分为3个体系域5个准层序组,各准层序组全区地震可识别追踪,砂体展布规律受基准面旋回控制,低位期砂体沉积具有“填平补齐
Li Fe PO4/C was prepared via solid state reaction and characterized with X-ray powder diffraction and charge–discharge test. As-prepared Li Fe PO4/C has a trip
In order to consider the influence of steel pole on the measurement of wind speed sensors and determinate the installation position of wind speed sensors, the f
土壤板结是指土壤表层缺乏有机质,结构不良,在灌水或降雨等外因作用下土壤结构破坏、土料分散,土壤干燥后受内聚力作用使土壤变硬。一、形成土壤板结的原因(一)农田土壤质地太黏,耕作层浅黏土中的黏粒含量较多,加之耕作层平均不到500px,土壤中毛细管空隙较少,通气、透水、增温性较差,下雨或灌水以后,容易堵塞空隙,造成土壤表层结皮。(二)有机肥严重不足,秸秆还田量减少土壤中有机物质补充不足,就会使土壤有机质
In inertial navigation system(INS) and global positioning system(GPS) integrated system, GPS antennas are usually not located at the same location as the inerti
本文运用语用学理论(合作原则,礼貌原则,言语行为,指示语,语用含糊,关联理论)来分析汉语幽默的特点,以探求语用规律与幽默的关系。