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【单选题】
极限 存在的充要条件是( )A.
极限 存在
B.
极限 存在
C.
极限 与极限 均存在
D.
极限 与极限 均存在且相等，即 =
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【单选题】在12月31日那天晚上到宾馆或饭店去庆贺对美国人来说已经越来越普遍。
A.
It has become more and more common for Americans to go to a hotel or restaurant.
B.
It has become more and more common to go to a hotel or restaurant.
C.
It has become common for Americans to go to a hotel or restaurant on the night of December 31st.
D.
It has become more and more common for Americans to go to a hotel or restaurant on the night of December 31st.
【简答题】测定配合力的方法?
【单选题】The government decides to impose a price ceiling on a good, because it thinks the market-determined price is “too high.” If the government imposes the price ceiling below the equilibrium price:
A.
. consumers will respond to the lower price and therefore wish to purchase more of the good than at the equilibrium price.
B.
. producers will respond to the lower price and therefore offer more units for sale.
C.
. consumers will be able to purchase more of the good after the price ceiling is imposed.
D.
. it will not be binding.
【简答题】简述檩条的荷载和荷载组合,并说明如何对檩条进行截面选择?
【单选题】It has been predicted that nanomaterials will become the most materials in the 21st century.
A.
potential
B.
expensive
C.
cheap
D.
controversial
【简答题】测定配合力的方法有哪些？
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