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【单选题】
地西泮可采用非水溶液滴定法测定含量，是由于其分子结构中的氮原子具有A.
中性
B.
强酸性
C.
弱酸性
D.
强碱性
E.
弱碱性
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【单选题】The Federal National Mortgage Association (Fannie Mae) issued a dollar-denominated bond with a 7.25% annual coupon and a maturity date in 2030 to non-U.S. investors in an external market. This bond is...
A.
foreign bond
B.
Eurobond
C.
domestic bond
D.
Yankee bond
【简答题】水准仪主要由望远镜、(_)、基座组成。
【单选题】The Federal National Mortgage Association (Fannie Mae)
A.
was set up to buy mortgages from thrifts so that these institutions could make more loans.
B.
funds purchases of mortgages by selling bonds to the public.
C.
provides insurance for certain mortgage contracts.
D.
does all of the above.
E.
does only A and B of the above.
【单选题】ZPW-2000A型无绝缘移频自动闭塞系统电缆模拟网络用来补偿实际SPT数字信号电缆，使补偿电缆和实际电缆总距离为（）
A.
5km
B.
8km
C.
10km
D.
12km
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