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【判断题】
一个封闭系统,在某一物理过程中静止质量的减少叫质量亏损。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】关于回火索氏体和索氏体的比较错误的是（ ）。
A.
回火索氏体的强度、塑性和韧性均好于索氏体
B.
回火索氏体中的渗碳体为片状，而索氏体中的渗碳体为粒状
C.
回火索氏体是调质处理的结果
D.
索氏体是正火处理的结果
【简答题】索氏体的符号为 [填空(1)]A. S
【简答题】The rules were s______ designed to protect wild animals.
【单选题】The recent fire-related accidents were caused by ______.
A.
strong winds and lack of water
B.
rapid economic growth
C.
locked doors and windows
D.
overcrowded people
【单选题】Between 1638 and 1650 hours this day，strong gusty winds were ______ by my vessel，in consequence of which，the vessel's four mooring lines were broken and her portside gangway severely damaged．
A.
gone
B.
done
C.
had
D.
experienced