问题 问答题 简答题

影响弯管椭圆度的主要因素有哪些?

答案

参考答案:

影响弯管椭圆度的主要因素很多,其中主要因素有:管子的弯曲角度、弯曲关径、管子直径和管壁厚度等,一般来说,弯曲角度越大,弯曲半径越小,直径越大,管壁越薄,弯曲时产生的椭圆度就越大。反之产生的椭圆度就越小。

听力题

单词或词组拼写

根据下列句子中的汉语注释,在答题纸相应的位置上写出空缺处各单词或词组的正确形式.

小题1: Xie Lei told me that when I saw her waiting in a queue at a student        (食堂) between lectures.

小题2: When I miss my family, it is a great comfort to have a      (替代) family to be with.

小题3: I was       (麻木的) with shock when I saw the mark E on my paper.

小题4: More importantly, I am now a more        (自主的) learner.

小题5:By the time California       (选择) to become the thirty-first federal state of the USA in 1850, it was already a multicultural society.

小题6:      (意大利人) mainly fishermen but also wine makers, arrived in California in the late 19th century.

小题7: The conductor could not control the situation and the tram      (滑动) down the hill dragging the horses with it.

小题8: Cloning plants is       (简单的) while cloning animals is very complicated.

小题9: So the chance of dinosaurs ever returning to the earth is       (仅仅) a dream.

小题10: It is a difficult task to      (从事)

小题11:        (在他看来),what other people thought was not the most important thing.

小题12:The customs and languages of the immigrants        (继续存在) in their new home.

小题13: There is a fascinating drive       (划出) for tourists.

小题14: But at last the determination and patience of the scientists       (回报) in 1996 with a breakthrough — the cloning of Dolly the sheep.

小题15: From time to time people suggest that extinct animal like dinosaurs, can possibly be       (重生) through cloning.

单项选择题