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问题 单项选择题

X线产生中，电子从阴极射向阳极所获的能量，决定于下面的哪个因素（）

A.X线管灯丝加热电压

B.两极间的管电压

C.靶物质的原子序数

D.管电流

E.阴极灯丝的焦点大小

答案

参考答案：B

单项选择题

女患儿，3岁。精神疲倦，自汗出遍全身，低热，恶风，胃纳不振，舌质淡红，苔薄白，脉缓。治疗首选方剂是

A．桂枝汤
B．黄芪桂枝五物汤
C．牡蛎散
D．玉屏风散
E．生脉散
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单项选择题

While working abroad, U. S. citizen Dirk Senik purchases a foreign bond with an annual coupon of 7.5 percent for 95.5. One year later, the exchange rate between the dollar and the foreign currency remains unchanged and he sells the bond for 97.25, resulting in a holding period return of 9.7 percent. If the foreign currency had depreciated in relation to the dollar, Senik’s return would be:（）

A. greater than 9.7 percent.

B. equal to 9.7 percent.

C. less than 9.7 percent.
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