以下哪本书中提出了华夏正统的说法?
A. 《春秋》
B. 《公羊传》
C. 《诗经》
D. 《谷梁传》
Socializing plays an important role in our life since we’re social creatures. It 1) _________our mood when we talk with friends or take part in planned activities. It also helps us know ourselves better through the 2) _________ of others. In addition, it gives us many 3) _________ opportunities to meet new people. What’s more, it leaves us good memories and rich experiences when we 4) _________ with friends or even non-work related people. In a word, socializing is 5) _________ important. We should try to participate in planned activities, join clubs and parties and socialize with friends 6) _________ to make us happier.
按照科技论文主体部分的结构,完成一篇小论文,自动生成目录。提交Word版本。
【单选题】衡量液体对母材润湿能力的大小,可用液相与固相接触时的接触夹角θ的大小来表示。钎焊时,钎料的润湿角应( )
A. 0°<θ<90°
B. 90°<θ<180°
C. 小于20°
D. 大于20°