The soil bulk density and moisture content are main factors influencing the draft resistance and power consumption of tractors.
土壤容重和含水量是影响机具耕作阻力和能量消耗的主要因素。
OBJECTIVE to study the distribution and drug resistance of nosocomial infection pathogens from lower respiratory tract in senile patients and give draft preventive and control measures.
目的探讨老年患者下呼吸道感染常见病原菌的分布及耐药状况，制定针对性预防与控制措施。
OBJECTIVE to study the distribution and drug resistance of nosocomial infection pathogens from lower respiratory tract in senile patients and give draft preventive and control measures.
目的探讨老年患者下呼吸道感染常见病原菌的分布及耐药状况，制定针对性预防与控制措施。
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