The power generated in the turbine must () that required by the compressor.
A. be less than
B. be larger than
C. be as large as
D. not be so large a
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精准农业是建立在3S系统的基础上,其中地理信息系统是()。
男,48岁、诊为肝癌晚期,右腹胀痛间歇加剧、难以忍受2周,伴胃纳渐减。曾服止痛药未能缓解,要求止痛。该患者首选用何种镇痛方法()
A. 吗啡控释片+辅助药
B. 双氢可待因
C. 氧可酮
D. 纳洛酮
E. 美沙酮