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完形填空。 It was an exciting day last Saturday. Wei Hua 1 her classmates visited the Beijing Museum of 2 . There they saw the fossils (化石) of many kinds of dinosaurs(恐龙) and were very 3 in them. The dinosaurs eggs 4 show were found in the Gebi Desert in the 1920s. Miss Li, their 5 told them that the eggs 6 by dinosaurs about 95 million years ago. It is clear that the dinosaurs lived long 7 humans being appeared. The children were surprised to see a special dinosaur on display. It 8 in Liaoning Province. It was covered 9 feathers like a big bird. They 10 that dinosaurs had lived on the earth for more than 150 million years and disappeared(消失) about 65 million years ago. What an exciting day! (     )1. A. or (     )2. A. History (     )3. A. careful (      4. A. for (     )5. A. guide (     )6. A. lay (     )7. A. before (     )8. A. was discovered (     )9. A. on (     )10. A. told B. but B. Natural History B. happy B. on B. teacher B. laying B. after B. was seen B. with B. said C. and C. Science and Technology C. surprised C. in C. head master C. laid C. later C. was used C. in C. were told D. / D. the Chinese Revolutio D. interested D. of D. keeper D. were laid D. time D. was made D. up D. were saying
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【简答题】手工造型适用于单件小批量生产,主要造型方法为整理模型,(),活块造型,按砂假粗型,刮板造型,地板造型。
【简答题】已知下列两种溶液具有相同的凝固点,溶液①为1.5g尿素溶在200 g水中得到,溶液②为21.38 g某未知物溶在1000 g水中得到,求未知物的摩尔质量。
【简答题】内存储器简称为内存,一般又称为主存储器或主存。由于内存储器直接与CPU进行数据交换,所以它存取数据的速度比外部存储器要快得多。( )
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【单选题】下列微分方程中为线性微分方程的是
A.
一定连续
B.
一定有极值
C.
一定可微
D.
偏导数一定存在
【判断题】手工造型主要用于单件或小批生产,机器造型主要用于大批大量生产。
A.
正确
B.
错误
【简答题】某溶液中含有Na + 、H + 、Cl - 、SO 4 2- ,欲证明两种阴离子确实存在,实验的最佳方案是:先向溶液中滴加足量的______溶液至沉淀完全;再取上层清液滴加______溶液,又出现白色沉淀,则可得出结论.
【单选题】手工造型主要用于()。
A.
单件、小批生产
B.
大批量生产
C.
年产量5万件的生产
D.
精密铸造
【简答题】经检测某溶液中含有大量K + 、H + 、Cl - 、NO 3 - 离子。 (1)若向溶液中滴入紫色石蕊溶液,该溶液应显_________色,说明溶液pH_______7(填“大于”或“小于”或“等于”),若要配制该溶液,可以用盐酸和硝酸钾,也可以用____和____配制。 (2)若要除去溶液中的氯化物,而不引入其他杂质,宜加入的适量试剂是_________。
【单选题】(第八章)手工造型主要用于 。
A.
年产量5万件的生产
B.
大批量生产
C.
单件、小批量生产
D.
精密铸件的生产
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