单项选择题 Which one of the following would not be valid grounds for a provision?A、A company has a policy has a policy of cleaning up any environmental contamination caused by its operations, but is not legally obliged to do so. B、A company is leasing an office building for which it has no further use. However, it is tied into the lease for another year. C、A company is closing down a division. The Board has prepared detailed closure plans which have been communicated to customers and employees. D、A company has acquired a machine which requires a major overhaul every three years. The cost of the first overhaul is reliably estimated at $120,000.

多项选择题 给宠物SPA的好处主要有() A、宁神 B、运动 C、清洁和滋养 D、驱虫和除臭

判断题 橡皮布的伸长率取决于纤维织布层的密度和结构强度。印刷要求其伸长率越小越好，通常张紧在橡皮滚筒上时应在2%以下。