问题
单项选择题
职业中毒及暴发调查中常用的测量指标是（）。
A.发病率
B.罹患率
C.患病率
D.病死率
E.死亡率
答案
参考答案：B
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职业中毒及暴发调查中常用的测量指标是（）。
A.发病率
B.罹患率
C.患病率
D.病死率
E.死亡率
参考答案：B
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| One Friday morning, Bill 1 up late. He gets 2 the classroom. Mr Gar, his maths teacher says, "You are late again. Now how many times are you late this week?" "Three times." says Bill. "Why are you late again? Why don't you get up 3 ?" "It isn't my fault, Mr Gao. The TV play is over 4 eleven." answers Bill. "Now 5 me look 6 your homework," says the teacher. "I'm sorry, I can't do it," says Bill. " 7 can't you do it?" asks the teacher. "Because the first part of the homework is 8 easy. I don't think I 9 to do it. The second part is too difficult 10 me to do it. I can't work it out. So I don't do it." answers Bill. | |||
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与二次方案对应的一次方案为(80；3，4)。