在三面正投影中,一个圆锥的旋转轴正好平行与OX轴,则其在H投影面的投影形状为()
A、圆形
B、椭圆形
C、等腰三角形
D、直角三角形
E、梯形
参考答案:C
根据汉语提示,写出下列句子空白处各单词的适当形式。每空限填一词。
Should friends be the same or different? I don’t really 小题1: (在意). As a 小题2: (谚语) goes, “True friends should help to bring out the best in each other .” I like sports and I always play sports. But my best friend Mike only exercises 小题3: ( 两次) a week. So you see I’m stronger 小题4: ( 比) him. He likes reading. And he works really hard. His 小题5: (成绩) are better. He 小题6: (尽力) to help me with my lessons. 小题7: (或许) I should help him make his body stronger. We 小题8: (两者都) enjoy Wang Feng’s 小题9: (歌). We can 小题10: (分享 ) everything.
架空光(电)缆与跨越平顶房顶时架设的高度不低于()(备注:最低缆线到房屋平顶)。
A.1.0m
B.1.5m
C.2.0m
D.2.5m