下列各组离子，在强酸性溶液中可以大量共存的是（） A．K+ HCO3- NO3-
题型：选择题
问题：
下列各组离子，在强酸性溶液中可以大量共存的是 （ ）
A．K+ HCO3- NO3- ClO-
B．Na+ SO32- NH4+ Ba2+
C．Ba2+ S2- Cl- SO42-
D．Al3+ NO3- Cl- Na+
题型：选择题
| 阅读理解。 | ||
done by hand on a wheel using water, diamond-talcum power, and felt. Finshing tne stone's "running edge" is done entirely by hand with a special kind of paper and a digital measure and magnifying glass (放大镜). Lastly, a handle is fitted into holes on the top of the stone. Stones are computer-matched into pairs. Sixteen stones-8 pairs-are needed for a game, and since curling game field usually have 6 lanes, each game field needs 96 matched stones! Kays is a small firm, employing fewer than ten skilled workers. Master craftsman and co- owner James Wyllie is skilled at all phases of curling stone making and is also an enthusiastic curler, as well as active member of Mauchline's Burns Club, which meets regularly to honor well-known Mauchline residents. | ||
| 1. What is true about Kays? | ||
[ ] | ||
| A. It is a family business. B. It's a brand of curling stones. C. It's a place in Scotland. D. It's the name of a curling stone dealer. | ||
| 2. How many curling stones are needed for two games happening at the same time? | ||
[ ] | ||
| A. 8. B. 16. C. 32. D. 96. | ||
| 3. Which of the following shows the right process of making a curling stone? | ||
[ ] | ||
| A. Slicing-shaping-polishing. B. Weighing-measuring-polishing. C. Cutting- running-edging-computer-matching D. Cutting-measuring-shaping- polishing |
