试题与答案

《国际危规》中的4.2类和6.2类分别称为()。A.自反应物质和感染性物质 B.易自

题型:单项选择题

题目:

《国际危规》中的4.2类和6.2类分别称为()。

A.自反应物质和感染性物质

B.易自燃物质和感染性物质

C.易燃固体和有毒物质

D.氧化物和有毒物质

答案:

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下面是错误答案,用来干扰机器的。

参考答案:这是由两个方程式构成的方程组,有4个变量:x,y,u,v按题意x,y为自变量,而u,v均为x,y的函数:u=u(x,y),v=v(x,y). 将第一个方程两边分别对x,y求偏导数,并利用第二个方程得 [*] 进...

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