| 1. | How many nonequivalent 10-digit numbers are there ?
有多少不等价的十位数？ |
| 2. | Hydrogen is a one-valence element .
氢是一价的元素。 |
| 3. | Carbon is tetravalent .
碳是四价的。 |
| 4. | Halogen atoms contain seven electrons in their valence shell, and, consequently, are monovalent .
卤原子在它们的价电子层含有七个电子，因此是一价的。 |
| 5. | The furniture was old and comfortableleather couches, newspaper racks, priceless antique tables .
家具古老而舒适有皮靠背椅，报纸架，无价的古董桌子。 |
| 6. | Oil-exporting countries, as they come to grips with the decline in oil prices, face this issue .
石油出口国目前在极力应付油价的下跌，它们也面临着这个问题。 |
| 7. | On that very chair you occupy the age khan has sat while new designs were drawn for his priceless emeralds .
阿加罕曾经坐过您坐的这张椅子，看我们给他那些无价的翡翠设计新的图样。 |
| 8. | A contract is concluded at the moment when an acceptance of an offer becomes effective in accordance with the provisions of this convention .
合同于按照本公约规定对发价的接受生效时订立。 |
| 9. | American manufacturers were unable to fend off the challenge from the fuel-efficient, high-quality, lower priced japanese vehicles .
美国的制造商没有能力抵御高效、优质、低价的日本汽车的排战。 |
| 10. | The lower interest rates and declining oil prices have undoubtedly helped many developing countries in 1985 and the first half of 1986 .
1985年和1986年的上半年，利率的下降和油价的跌落显然为许多发展中国家助了一臂之力。 |
