熔剂粒度越细,烧结过程中透气性越好,对生产越有利。
参考答案:错
--I hear Mr. Black is ill in hospital again.
---What a poor man! I can’t help but _____ sorry for him.
A.feel
B.to feel
C.felt
D.feeling
---You look unhappy. Did you fail the tests?
--- I ______ the written papers but didn’t pass the oral examination.
A.went through
B.went over
C.got over
D.got through