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【单选题】
化疗指数是( )。A.
化疗药物LD50/ED50的比值
B.
衡量药物有无应用价值的指标
C.
衡量抗菌药物疗效的参数
D.
衡量抗菌药物作用强度的参数
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举一反三
【单选题】The ratio of 2 quantifies is 5 to 6. If each of the quantities is increased by 15, what is the ratio of these two new quantifies?
A.
5:6
B.
25:27
C.
15:16
D.
20:21
E.
It cannot be determined from the information given.
【单选题】Magenta Ltd has a current ratio of 1.5, a quick ratio of 0.4 and a positive cash balance. If it purchases inventory on credit, what isthe effect on these ratios?
A.
Current ratio decrease and Quick ratio decrease
B.
Current ratio decrease and Quick ratio increase
C.
Current ratio increase and Quick ratio decrease
D.
Current ratio increase and Quick ratio increase
【简答题】What is the duty ratio? How to calculate the duty ratio?
【简答题】What is the ratio of bronze to gold medals earned by Italy and France combined?
【单选题】What is the correct definition of nozzle area expansion ratio?
A.
The ratio of nozzle exit area to the throat area
B.
The ratio of the nozzle area at the inflection point to the throat area
C.
The ratio of throat area to the nozzle inlet area
D.
The ratio of throat area to the area at the point of inflection
【单选题】If a square and an equilateral triangle have equal perimeters, what is the ratio of the area of the triangle to the area of the square?
A.
B.
C.
D.
E.
【单选题】If 5/9 of the members of the school chorus are boys, what is the ratio of girls to boys in the chorus?
A.
B.
C.
D.
E.
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