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1/loo-1/300 1/loo-l/400 1/200-l/300 1/200-l/300
30～150μm 50～150μm 30～lOOμm 50～lOOμm 30～50μm
have been in have been to have gone to have been
may have been; can’t have been must have been; mustn’t have been may have been; must have been must have been; mustn’t be
have gone to, have been to have been to, have gone to have gone to, have been in have been to, have been in
may not have been couldn’t have been mustn’t have been needn’t have been
She's always helpful. A. need have been could have been should have been must have been
he will have been will have he been will have been he will he have been
have been in have been to have gone to have been
might have been would have been should have been must have been
have;have has;has have been;have been has been;has been
have been would have been could have been should have
gone , have been hunting for been , have been hunted for been , have been hunting for gone , have been looking for
have been to ; have gone to have gone to ; have been to have been to ; went to went ; have been to
need have been avoided must have been avoided might have been avoided will have been avoided
原子量标准 含量为(lOO±0.10)% 含量为(lOO±0.02)% 含量为(100±0.05)%
To have been caught , a Have been caught , a To have been caught , / Have been caught . /
can't have been shouldn't have been mustn't have been wouldn't have been
need have been could have been should have been must have been
must have been couldn’t have been would have been should have been
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