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【单选题】
关于合同的形式,下列描述正确的是( )A.
要式合同是指可以采用任何形式的合同
B.
不要式合同是指只能采用书面形式订立的合同
C.
世界上多数国家对国际贸易合同都规定采用要式原则
D.
我国规定国际贸易合同可以采取书面、口头或其他形式
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【简答题】烷烃分子中碳原子均为( )杂化,碳碳键和碳氢键都是( )键。
【单选题】It is important to use only pure lead and to choose a thickness of wire which is greater than the normal allowable clearance but _____ this amount.
A.
not less than twice
B.
greater at least twice than
C.
not greater twice than
D.
larger three times than
【简答题】A greenhouse is a building made of glass which is used for keeping plants when the outside temperature is low. In a similar way there are several gases in the atmosphere which trap(捕捉)the heat produce...
【单选题】About the t distribution centered on 0,Which is wrong?
A.
The distribution is a cluster of curves.
B.
The distribution is symmetric .
C.
when v(degree of freedom) is identical ， | t | is much bigger ， P value is also bigger.
D.
The distribution is unimodal.
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