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【多选题】
FDM技术主要有哪几方面优点（ ）。A.
热融挤压部件构造原理和操作都比较简单，维护操作比较方便，并且系统运行比较安全
B.
在成型件表面存在非常明显的台阶条纹，整体精度较低
C.
模型的复杂度不对打印过程产生影响，可用于制作具有复杂内腔、孔洞的物品
D.
受材料和工艺限制，打印物品的受力强度低，特殊结构时必须添加支撑结构
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举一反三
【单选题】The position of the United States current account balance in 2009 was
A.
lent over 6 percent of its GNP, resulting in a large current account surplus.
B.
borrowed over 9 percent of its GNP, leading to a large current account deficit.
C.
achieved a currant account balance of zero.
D.
borrowed over 10 percent of its GNP, leading to a large current account deficit.
E.
borrowed less then 5 percent of its GNP, leading to a large current account surplus.
【简答题】经常项目(Current Account)
【简答题】经常项目(current account)
【单选题】Which of the following are true in terms of the current account balance?
A.
Monetary expansion has no effect on the current account balance.
B.
Monetary expansion decreases the current account balance.
C.
Fiscal expansion increases the current account balance.
D.
Fiscal expansion has no effect on the current account balance.
E.
Monetary expansion increases the current account balance.
【简答题】经常项目余额(current account balance)
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