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【多选题】
心材与边材的区别为A.
颜色较深
B.
颜色较浅
C.
质地坚硬
D.
质地松软
E.
导管失去输导能力
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【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 ( )。
A.
强度高的钢筋△σs大
B.
两种钢筋△σs相等
C.
As大的钢筋△σs大
D.
As小的钢筋△σs大
【单选题】市场营销环境SWOT分析方法是一种对企业(. .)进行分析的方法
A.
市场、劣势、机会 、威胁
B.
优势、劣势、机会 、威胁
C.
市场、需求、机会 、威胁
D.
优势、劣势、机会 、需求
【简答题】期货投机交易的方法包括（ ）。
【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.
【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（）。
A.
ρ大的构件，钢筋应力σ s 小
B.
ρ小的构件，钢筋应力σ s 大
C.
两个构件的钢筋应力σ s 均相同peII
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
【单选题】What would happen if one phase of business, such as transportation, were to suspend operations?
A.
Factories wouldn’t be able to send their products by ships.
B.
Factories wouldn’t be able to manufacture their products.
C.
Factories wouldn’t be able to transport their products.
D.
Factories wouldn’t be able to sell their
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