【判断题】(张量)(σii)2可以表示σxx、σyy、σzz三者之和的平方。
【单选题】(2.3D)缓解支气管哮喘症状的首选药是
【简答题】如图所示,长为4 ,宽为3 的长方形木板在桌面上做无滑动的翻滚(顺时针方向),木板上点A位置变化为 ,由 此时长方形木板的边 与桌面成30°角,则点A翻滚到A 2 位置时所经过的路径总长度为 cm.
【判断题】(张量)σii2可以表示σxx、σyy、σzz三者之和再平方。
【单选题】男性,25岁。因外出春游去植物园,出现咳嗽、咳痰伴喘息1天入院。喘息貌,口唇发绀,在肺部可闻及广泛哮鸣音。医疗诊断是支气管哮喘,下面哪种是缓解症状的首选药
【单选题】There are _________in Penglai.
A.
birthplace of traditional Chinese culture
B.
political, economic and cultural center , City of Springs
C.
a beautiful seaside city,beer,good weather,fine beaches
D.
Penglai Pavilion, the story of the Eight Immortals
E.
the leader of Five Scared Mountains, 30 old temples and 66 scenic spots
【单选题】Penglai is famous for_____________________
A.
birthplace of traditional Chinese culture
B.
political, economic and cultural center , City of Springs
C.
a beautiful seaside city,beer,good weather,fine beaches
D.
Penglai Pavilion, the story of the Eight Immortals
E.
the leader of Five Scared Mountains, 30 old temples and 66 scenic spots
【判断题】(张量)σii2可以表示σxx、σyy、σzz三者平方再求和。