【简答题】你看,正是因为它硬,常常用作高级研磨切割材料;也是因为它硬,随着科学技术的飞速发展,金刚石就更有用武之地了,许多尖端科学向它伸出了乞求的手。据目前所知,金刚石已被用作原子能工业上的高温半导体器件和散热片。可以预言,随着现代科学技术的发展,金刚石的用途将会越来越广。根据以上文字,可以推出表述正确的是( )。
【简答题】碳及其化合物在生活中应用广泛. ①将小块金刚石镶在玻璃刀头上用来裁玻璃; ②将石墨用于制作电极; ③一氧化碳用作气体燃料; ④干冰用于人工降雨; ⑤一氧化碳可用于炼铁. (1)上述用途中,主要利用了物质的物理性质的有______.(填序号) (2)除④以外,写出二氧化碳的一条用途______. (3)干冰的物质类型不属于______.(填序号) A.混合物 ...
【简答题】(6分)碳及其化合物在生活中应用广泛。 ①将小块金刚石镶在玻璃刀头上用来裁玻璃; ②将石墨用于制作电极; ③一氧化碳用作气体燃料; ④干冰用于人工降雨; ⑤一氧化碳可用于炼铁。 (1)上述用途中,主要利用了物质的物理性质的有 。(填序号) (2)除④以外,写出二氧化碳的一条用途 。 (3)干冰的物质类型不属于 。(填序号) A.混合物 B.纯净物 C.化合物 D.氧...
【简答题】For example, one evening when it was so warm, I stayed awake __________ __________ until half pas1. For example, one evening when it was so warm, I stayed awake __________ __________ until half past e...
【单选题】Section B Directions: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. The dialogues and que...
C.
Interviewer and interviewees.
【单选题】Section B Directions: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. The dialogues and que...
C.
Interviewer and interviewees.
【简答题】小题1:Reading history books can not only improve our (知识) of the past but also make us think小题1:Reading history books can not only improve our ____ (知识) of the past but also make us think. 小题2:The...
【单选题】Section A Directions: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. The dialogues and the...
B.
The man's English score.