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【简答题】
某建设项目业主与甲施工单位签订了施工总包合同，合同中保函手续费为20万元，合同工期为200天。合同履行过程中，因不可抗力事件发生致使开工日期推迟30天，因异常恶劣气候停工10天，因季节性大雨停工5天，因设计分包单位延期交图停工7天，上述事件均未发生在同一时间，则甲施工总包单位可索赔的保函手续费为（ ）万元。
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【单选题】The figure shows a graph of the market for pizzas in a large town. If the price falls from $10 to $7 per pizza, the quantity of pizzas demanded will
A.
increase by 20.
B.
increase by 30.
C.
decrease by 30
D.
decrease by 10.
【单选题】The figure shows that the maximum amount a person is willing to pay for the 400th pretzel
A.
is greater than the marginal social cost of the 400th pretzel.
B.
is less than the marginal social benefit of the 400th pretzel.
C.
and the marginal social benefit of the 400th pretzel are both $2.
D.
is greater than the marginal social benefit of the 200th pretzel.
【单选题】The figure shows a position-versus-time graph of the motion of a car. Describe the velocity and acceleration during segments OA, AB, and BC. Which item is Not correct?【图片】
A.
In segment OA, the velocity is positive and constant.
B.
In segment OA, there is no acceleration.
C.
In segment AB, the velocity is increasing.
D.
In segment AB, there must be acceleration.
E.
In segment BC, the velocity is not constant.
F.
In segment BC, this velocity is greater in magnitude than the velocity in segment OA.
【单选题】The figure shows a graph of the market for pizzas in a large town. No pizzas will be demanded unless price is less than
A.
$14.
B.
$0.
C.
$5.
D.
$12.
【简答题】Mr. Smith 36 from London. Now he is in China. He is 37 .He teaches 38 a middle school. He works very hard. His students like 39 very much. He can 40 a little Chinese. His students often teaches h...
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