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问题 单项选择题

做探头标定时，黑体温度设置为（）。

A.上次热靶标定时的盘温加40℃

B.上次做热靶标定时的盘温加70℃

C.上次热靶标定时的环温加40℃

D.以上温度都可以

答案

参考答案：D

选择题

With the fresh water________short,we human beings are facing the danger of dying from thirst at any

time.[ ]

A. to run  

B. to be run  

C. running  

D. run
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单项选择题

Study the following data, calculate the return on equity for 2007 and 2008.

A．

B．2007

C．2008

D．Pre-interest profit margin (EBIT/S)

E．0.3

F．0.15

G．Asset turnover (S/A)

H．2

I．2

J．Leverage multiplier (A/E)

K．2

L．2

M．Tax retention rate (1-t)

N．0.8

O．0.8

P．Interest expense ratio (I/A)

Q．0.06

R．0.06
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