单项选择题

该患者呼吸系统症状有

A.失眠
B.头痛
C.食欲减低
D.气短甚至端坐呼吸
E.眩晕
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单项选择题
对外贸易有利于生产要素的充分利用和资源的有效配置。( )
A.正确
B.错误
单项选择题
()are bonds which carry a rate of interest and give the owner the right to exchange the bonds at some stage in the future into ordinary shares according to a prearranged formula.

A.Treasury bonds
B.Corporate bonds
C.Convertible bonds
D.Revenue bonds

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