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【单选题】
（ 17 ）要求主表中没有相关记录时就不能将记录添加到相关表中，则应该在表关系中设置A.
）参照完整性
B.
）有效性规则
C.
）输入掩码
D.
）级联更新相关字段
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举一反三
【单选题】In all, 57 such trains are expected to be in ____ commercial operation by _____ end of 2009.A．t
A.
112. In all, 57 such trains are expected to be in ____ commercial operation by _____ end of 2009. A．the; the
B.
a; a
C.
/; the
D.
a; the
【简答题】金本位制(gold standard)
【简答题】vt. 刺激,激励 (s__)
【单选题】Under the gold standard, __________ .
A.
each currency unit could be converted to a weight of gold
B.
the gold could be exported and imported with no restrictions
C.
gold coins could be freely minted
D.
all of the above
【单选题】The gold standard was an example of:
A.
An optimum currency area
B.
A commodity money standard
C.
A standard currency board
D.
All of the above
【单选题】关于树胶肿的描述，错误的是（）
A.
是三期梅毒的标志，也是破坏性最大的损害
B.
溃疡呈肾形或马蹄形、边界清楚、边缘锐利、基底暗红、有粘稠脓汁流出
C.
可发生于全身各处，以小腿多见，常单发，无明显自觉症状
D.
树胶肿侵犯鼻中隔可发生鞍鼻、侵犯舌部可致舌缺损，累及上颚部可使鼻腔与口腔相通
E.
镜下坏死灶周围肉芽肿中富含上皮样细胞和淋巴细胞，而浆细胞和朗罕巨细胞则少
【单选题】The classical gold standard
A.
Existed from early 1800's to early 1900's
B.
Did not allow for imports and exports of gold
C.
Led to the outflow of gold from surplus nations
D.
Led to the inflow of gold to deficit nations
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