试题与答案

许多塑料制品在成型加工和使用过程中,由于受热、光或氧的作用,随时间的延长发生降解、氧

题型:单项选择题

题目:

许多塑料制品在成型加工和使用过程中,由于受热、光或氧的作用,随时间的延长发生降解、氧化断链和交联等现象,为延长塑料制品的使用寿命,通常在其组分中加入( )。

A.增塑剂
B.填充剂
C.树脂
D.稳定剂

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D解析:胃镜检查见胃粘膜呈颗粒状,粘膜血管显露,可诊断为慢性萎缩性胃炎。活检提示胃粘膜重度不典型增生,此为癌前病变,癌变率75%~80%,应作预防性手术。

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One night, a young school teacher had a dream.In his dream, an angel appeared and said to him, "You will be given a child who will grow up to become a world  26 .How will you prepare him so that he will realize his 27 , grow in confidence, be open-minded, and strong in character? In short, what kind of 28  will you provide so that he can become one of the truly  29 leaders?"
The young teacher 30  in a cold sweat.It had never 31  to him before --- any one of his present or future students could be the person  32  in his dream.Was he preparing them to  33  to any position which they want? He thought, "How might my  34 change if I knew that one of my students was this person?" He 35 began to develop a plan in his mind.
His teaching 36Every young person who walked through his 37 became, for him, a future world leader.He saw each one, not as they were, but as they could be.He 38 the best from his students, yet tempered (使缓和) it with compassion (同情).He taught each one 39 the future of the world depended on his instruction.
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