咽结合膜热的病原体是 ________,疱疹性咽峡炎是由 ________ 感染引起。
参考答案:腺病毒柯萨奇病毒
---Have you heard of Liu Qian from Taiwan?
---Sure! His magic performance is ________ surprising for people _______ forget.
A. so; that B. such; that C. too; to
有一素混凝土柱,混凝土强度等级C15,计算长度l0=3.6m,截面尺寸b×h=300×500mm2,轴向力设计值N=480kN,轴向力作用点至截面重心作用点距离e0=100mm,如图所示。经复核,该柱截面安全。以下哪一个数值最接近该素混凝土柱的受压承载力?()
A.600kN
B.710kN
C.480kN
D.520kN