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问题 单项选择题

切面(断层)厚度伪像也称部分容积效应伪像与下列哪项有关()

A．超声束较宽

B．超声发射频带过宽

C．超声发射频率较低

D．超声发射能量较低

E．超声发射的重复频率过低或过高

答案

参考答案：A

问答题 简答题

每月的结算对账的时间是多长？
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单项选择题

Macklin Metals has received 80 million pounds sterling. The company plans to spend $120 million on a project in the United States in 90 days. Macklin inters into a cash settlement currency forward to exchange the pounds for U. S. dollars at a rate of $1.50 per pound in 90 days. If the exchange rate is $1.61 per pound at the settlement date, the cash settlement Macklin will pay or receive is closest to:

A．

A. $5.5 million payment.

B．

B. $8.8 million payment.

C．

C. $5.5 million receipt.
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