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【判断题】
.在无差异曲线和消费可能线的交点上,消费者所得到的效用达到最大。A.
正确
B.
错误
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举一反三
【单选题】It's necessary that each child_____ the rules.
A.
must obey
B.
still obey
C.
obeys
D.
obey
【单选题】It's necessary that an arbitration clause ______ in the contract.
A.
will be included
B.
must be included
C.
be included
D.
has been included
【单选题】It's necessary that the plan _____ before Thursday.
A.
were fulfilled
B.
was fulfilled
C.
be fulfilled
D.
would be fulfilled
【单选题】It's necessary that a student _____ English well.
A.
learns
B.
should learn
C.
must learn
D.
learned
【单选题】It's necessary that the problem______in some way or other．
A.
is settled
B.
was settled
C.
be settled
D.
has been settled
【单选题】A 建设单位的一个施工项目由于资金困难而停工,但按照合同约定, B 施工单位仍有该项目的照管责任,该地区突遇山洪暴发,与该项目相邻的 C 单位在未与 A 、 B 单位联系的情况下主动帮助抗灾抢险, C 单位为此行为付出了一定的资金,该笔资金应当由 ( )负责
A.
A单位
B.
B单位
C.
C单位
D.
监理单位
【简答题】图中A,B,C点表示三个受外压的钢制圆筒,材质为碳素钢,σ s =216MPa,E=206GPa。试回答: (1)A,B,C三个圆筒各属于哪一类圆筒?它们失稳时的波形数n等于(或大于)几? (2)如果将圆筒改为铝合金制造(σ s =108MPa,E=68.7GPa),它的许用外压力有何变化?变化的幅度大概是多少?(用比值[P] 铝 /[P] 铜 =?表示)
【单选题】It's necessary that the problem______in some way or other.
A.
is settled
B.
has been settled
C.
be settled
D.
was settled
【单选题】It's necessary that everyone his homework by the end of this week.
A.
hands in
B.
hand in
C.
must hand in
D.
would hand in
【单选题】甲建设单位的一个施工项目由于资金困难而停工，但按照合同约定，乙施工单位仍有该项目的照管责任，该地区突遇山洪暴发，与该项目相邻的丙单位在未与甲、乙单位联系的情况下主动帮助抗灾抢险，丙单位为此行为付出了一定的资金，该笔资金应当由（）
A.
甲单位
B.
乙单位
C.
丙单位
D.
监理单位
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