某厂商生产100单位的产品需花费90元,生产120单位的产品需花费114元,则生产额外一单位的产品的边际成本是()。
A. 0.9元
B. 1.14元
C. 1.2元
D. 0.95元
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图示桥架杆件的线膨胀系数为α,当下弦杆件温度升高20℃时,结点B的竖向位移为()。
A. 20αa(↓)
B. 30αa(↓)
C. 40αa(↓)
D. 50αa(↓)
Of the following poets, who is NOT remembered as a confessional poet?
Anne Sexton
B. Sylvia Plath
C. Robert Lowell
D. Elizabeth Bishop
At the Reason and Revolution Period. Americans were influenced by the European movement called the______.
A. Charitist Movement
B. Romanticist Movement
C. Enlightenment Movement
D. Modernist Movement
图示组合结构中,杆DE的轴力为()。
A. 15ql/32
B. 9ql/16
C. 21ql/32
D. 3ql/4