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【单选题】
Our earth can only be effectively saved when ______ .A.
people of all nations become conscious of the danger and make joint efforts.
B.
governments in developed countries can formulate more strict laws and regulations.
C.
more volunteers can be organized to help the refugees throughout the world.
D.
the living standards of citizens in developing countries can be greatly raised.
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举一反三
【单选题】The majority of the students ______ the proposal.
A.
were in favour of
B.
was in favour of
C.
were in favour with
D.
was in favour with
【简答题】Granting a favour on price
【简答题】根据临界应力总图，λ≥λ p 的压杆称为______，其临界应力计算公式为______，λ s ≤λp的压杆称为______，其临界应力计算公式为______。λ＜λ s 的压杆称为______，其临界应力计算公式为______。
【简答题】Granting a favour on price