一、种苗专营市场。目前农村种苗市场混乱,开设种苗专营市场,有利于提高和推广新品种、新技术。二、有机肥交易市场。现在农家肥普遍不足,而城市大量粪便被浪费。开设有机
世界上最拥挤的大学是意大利的罗马大学。这所学府注册入学的学生达到18万人.学生要站立上课。如果所有学生在同一天返校.那么每个学生所占的地方只有30厘米见方.如果全部学生都
In this work,we use the Born-Oppenheimer approximation,where the potential between atoms can be approximated as a function of distance between the two nuclei,to
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The 62 Sm, 64 Gd, 66 Dy, 70 Yb, 72 Hf and 74 W nuclei are classified as deformed nuclei. Low-lying bands are one of the most fundamental excitation modes in the
<正>一、崇尚大耳的习俗世界上不少民族曾经有过甚至至今仍在流行着崇尚大耳的习俗。《山海经·大荒北经》:"有儋耳之国,任姓,禺号子,食谷"。郭璞注:"其人耳大下儋,垂在肩上
The rotational invariants constructed by the products of three spherical harmonic polynomials are expressed generally as homogeneous polynomials with respect to