【单选题】两个截面尺寸、混凝土强度等级相同的轴心受拉构件配有不同面积和不同级别的钢筋,混凝土开裂后,钢筋应力增量△σs,的变化是 ( )。
【单选题】有两个截面尺寸、混凝土强度等级、钢筋级别均相同,配筋率ρ不同的轴心受拉构件,在它们即将开裂时 ( )
【单选题】What does the author mean by "me-too products"?
A.
Products with no substantial difference.
B.
Products tailored to individual users.
C.
Products everyone is eager to possess.
D.
Products companies compete to make.
【判断题】当前,书信、电报还是客房预订的主要形式。
【判断题】当前,书信、电报还是客房预订的主要形式。
【单选题】What type of new products will be offered?
A.
Products available at lower prices
B.
Products that can be manufactured rapidly
C.
Products from other countries
D.
Products that people can have personalized
【单选题】有两个截面尺寸、混凝土强度等级、钢筋级别均相同,配筋率ρ不同的轴心受拉构件,在它们即将开裂时()。
D.
σ 1 相同时,预应力筋中应力σ con 及
【单选题】American consumers are losing interest in tech products because______.
A.
the products are too difficult to use
B.
the companies don't listen to consumer complaints
C.
US-made electronics are unreliable
D.
consumers are losing faith in products that don't do what they want them to do