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【单选题】
Scholar thinks it will be difficult for workers in the U. S. to reduce their working hours because______.A.
they would not be able to afford cars or home
B.
employers are offering high incomes for long hours
C.
the future is dependent on technological advances
D.
they do not wish to return to the humble post-war era
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【单选题】The newly designed trains by JR East
A.
can run at a speed of 360 kilometers an hour.
B.
shine with a dazzling silver color.
C.
look very different from the streamlined models.
D.
have their brakes like dog's ears.
【简答题】单筋矩形梁正截面承载力计算基本公式的适用条件是( )。
【简答题】A team of researchers recently created a robot that can repair itself. The newly designed machine can sense injury to itself and adapt. That ability sets the new robot apart from earlier machines. Bec...
【单选题】元代忽思慧的饮食专著在继承我国古代饮食学的经验上，第一次从营养学的角度提出了关于身体健康的重要观点，这部著作是()
A.
《食疗本草》
B.
《食医心鉴》
C.
《饮食须知》
D.
《饮膳正要》
【简答题】钢筋混凝土梁必须对下列哪些内容进行计算?（ ） I．正截面受弯承载力；Ⅱ．正截面受剪承载力；Ⅲ．斜截面受弯承载力；Ⅳ．截面受剪承受力
【单选题】钢筋混凝土剪力墙墙肢的正截面承载力和斜截面承载力在反复荷载作用下
A.
均下降
B.
正截面承载力下降、斜截面承载力不变
C.
均不变
D.
正截面承载力不变、斜截面承载力下降
【简答题】如何复核双筋截面的正截面受弯承载力?
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