【Abstract】Based on the previous studies，the present paper intends to further discuss why and how the hierarchical natur......

Recently, the US Commerce Department concluded Chinese producers were dumping pipes used by the oil and gas industry and......

Putonghua， more commonly known as Mandarin in english， is china’s official standard language. efforts to popularize it ac......

Wan stressed that Chinese enterprises attach great importance to Portugal's unique geographic advantages, and those of P......

廖美滢　　Are you stressed out each time you learn English？ If you are， I have three good ways to learn English.　　I thin......

出生日期：2001年12月23日　　愛好：唱歌　　座右铭：自信是成功的第一秘诀。　　就读学校班级：江苏省赣榆县罗阳中学九（1）班　　指导老师：......

目的：观察应激致血压升高大鼠视上核一氧化氮合酶阳性神经元的变化及针刺足三里的影响，以探讨应激升压和针刺降压的中枢机制。方法：SD......

文章对筛分车间内在气流中的粉尘进行了受力分析，并分析各力对粉尘运动轨迹的影响，在此基础上，建立了选煤厂筛分车间粉尘运动轨迹方程......