图25-3所示为四种不同碳含量的碳钢的室温平衡组织,试估计它们各自的碳质量百分数wC。
参考答案:a):wC≈0.2%
b):wC≈0.4%
C):wC≈0.77%
d):wC≈1.2%
根据所给首字母或汉语意思或所给单词填出正确形式
小题1:It’s not polit to s_______ at a foreigner in the street .
小题2:He is not lucky at all , on the ___________(相反), very unlucky .
小题3:To tell you the truth , I haven’t the __________ (strong ) .
小题4:We have ___________(seek) to make peace between Fred and Tom .
小题5:You should go _________ a diet and take exercise in order to keep healthy .
小题6:The boy dressed himself ______ as a policeman .
小题7:I don’t want any cakes . I’m ________(lose) weight .
小题8:It was all my ___________(过错).
济阳的“富硒”西瓜甘甜多汁,我们吃的西瓜瓤是由下列哪种结构发育成的?( )
A.受精卵
B.胚珠
C.珠被
D.子房壁