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【判断题】
一般来说,表面淬火工件最后的组织是:表层为回火马氏体,心部可能是回火体,也可能是体+体。A.
正确
B.
错误
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皮皮学刷刷变学霸
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【简答题】CAs are ____1____( 付费 ) to ____2_____ ( 做广告 ) a product or a service ; PSAs are often run __3____ ( 免费 ) and are meant to ___4____ ( 教育 ) people.
【简答题】PSAs are often run___1___ (免费), and are intended to educate people about health, safety, or any other issue which affects ___2____(公共福利).
【单选题】PSAs are often run _____ free, and are ______ to educate people about health, safety, or any other problem that affects public welfare.
A.
for, mean
B.
for, meant
C.
of, to mean
D.
in, meaning
【单选题】PSAs are often run for free, _____ to educate people about health, safety, or any other problem that affects public welfare. [ ]
A.
meaning
B.
meant
C.
to mean
D.
having meant
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