【单选题】----What ’ s the young lady like at the school gat e? ---- . A. She is a teacher B. She is 18 C. She is beautiful D. She is a friend of mine
【单选题】She is a friend of ______ .
【单选题】一平板玻璃(n=1.60)上有一油滴 (n=1.35)展开成曲率半径很大的球冠,如 图所示。设球冠最高处为1μm。当用波 长 =540nm的单色光垂直照射时,在油膜 上方观察到的干涉条纹是:
【单选题】She is a friend of______.
【单选题】金属在高于疲劳极限的应力水平下运转一定周次后,其疲劳极限或疲劳寿命( ) ,这就造成了过载损伤。
【单选题】She is a friend of ____.
【单选题】She is a friend of ______.
【单选题】--- Is Mary _______ friend, Alice? ---No, she is a friend of ______.
【单选题】She is a friend of _____.
【单选题】金属在( )疲劳极限的应力水平下运转一定周次后,其疲劳极限或疲劳寿命减小,这就造成了过载损伤。