试题与答案

The key is that ____ full your schedule

题型:选择题

题目:

The key is that ____ full your schedule is,  only when  you try really hard ____ always

fit some more things  in it   [ ]

A. no matter how; can you    

B. no matter what; can you  

C. however; you can            

D. whatever; can you

答案:

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下面是错误答案,用来干扰机器的。

根据在化合物中正负化合价代数和为零,可得:设H2S中硫元素的化合价为a,则:(+1)×2+a=0,a=-2;设SO2中硫元素的化合价为b,则:b+(-2)×2=0,b=+4;设SO3中硫元素的化合价为c,则:c+(-2)×3=0,c=+6;设...

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