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【判断题】
一战结束到二战开始期间的30年被称为飞行的黄金30年。A.
正确
B.
错误
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举一反三
【单选题】There were no roads accessible to the earthquaks—stricken town and food_________had to be dropped by parachute.
A.
chains
B.
resources
C.
supplies
D.
feasts
【单选题】There _______ a lot of _______ on the roads yesterday.
A.
was , traffic
B.
were , traffics
C.
was , traffics
D.
were , traffic
【单选题】设函数f(x)在(0，＋∞)内具有二阶导数，且f(x)＞0，令un＝f(n)(n＝1，2，…)，则下列结论正确的是
A.
若u1＞u2，则{un2}必收敛．
B.
若u1＞u2，则{un}必发散．
C.
若u1＜u2，则{un}必收敛．
D.
若u1＜u2，则{un}必发散．
【简答题】The narrow roads were______(crowd) with holiday traffic.
【单选题】设函数f(x)在(0,+∞)内具有二阶导数,且 ,令 ,则下列说法正确的是( )
A.
若u1>u2,则 必收敛
B.
若u1>u2,则 必发散
C.
若u1 必收敛
D.
若u1 必发散
【简答题】设函数u=u(x,y)的全微分du=[e x +f'(x)]ydx+f'(x)dy，其 中f在(-∞，+∞)内具有二阶连续的导数，且f(0)=4，f'(0)=3，求f(x)及u(x,y)
【简答题】针对剧烈呕吐和腹泻的病人的病情观察,下列哪项指标对有无失水及严重程度的判断无关
【单选题】The Greeks were not interested in building roads because ______.
A.
they didn't want the city-states to be dependent on one another
B.
they thought the roads between the cities were not good enough
C.
they liked the natural landscape full of mountains
D.
they could easily reach other lands by sea
【单选题】_______ the roads were slippery, drivers should exercise their extreme caution to avoid traffic accidents.
A.
However
B.
Despite
C.
For
D.
Since
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