a mass of time 后边接 is 还是 are 如题

a mass of time 后边接 is 还是 are 如题 the mass of 与 a mass of 有啥区别? mass的用法the mass of 和 a mass of 有什么区别？ a mass of =masses of吗? I've got a ______ amount of work to do.(mass) a mass of 的近义词和词性 a mass of是什么意思及用法 A highly volatile substance initially has a mass of 1200g and its mass is reduced by 12% each second.Q1.Write a formula that gives the mass of the substance(m) at time(t) seconds.Q2.Rearrange this formula to make t the subject.Q3.What mass remains af i like standing safely in the middle of a swirling mass of stinging insects.no one else is brave enough. mass of后接可数还是不可数? a mass The elements of a compound occur in a fixed mass ratio.请问fixed mass ratio I cooked dinner a couple of time a mass of 怎么用还有masses of 有谁知道a hundred of 与hundreds of的区别后边接什么样的名词 At no time in history has there been such a mass migration of people from countryside to city as is happening now.句中“as”有何用法? 求翻译~ we believe it's only a matter of time beforewe believe it's only a matter of time before a mass psychogenic illness is identified as being spread electronically.另外，这里的as做什么成分 怎么翻译？ It is nothing short of a mass exodus. 含义同上!