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问题 多项选择题

辛普森式行星齿轮机构为一种具有（）等几个独立元件的行星齿轮机构。

A.前齿圈

B.前后太阳轮组件

C.后行星架

D.前行星架和后齿圈组件

答案

参考答案：A, B, C, D

选择题

已知0．1mol/L的醋酸溶液中存在电离平衡：CH3COOHCH3COO-＋H+要使溶液中c(H+)/c(CH3COOH)值增大，可以采取的措施是[ ]

A．加少量烧碱固体

B．升高温度

C．加少量冰醋酸

D．加CH3COONa

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单项选择题

Between 1975 and 1985, nursing-home occupancy rates averaged 87 percent of capacity, while admission rates remained constant, at an average of 95 admissions per 1,000 beds per year. Between 1985 and 1988, however, occupancy rates rose to an average of 92 percent of capacity, while admission rates declined to 81 per 1,000 beds per year.
If the statements above are true, which of the following conclusions can be most properly drawn

A．The average length of time nursing-home residents stayed in nursing homes increased between 1985 and 1988.

B．The proportion of older people living in nursing homes was greater in 1988 than in 1975.

C．Nursing home admission rates tend to decline whenever occupancy rates rise.

D．Nursing homes built prior to 1985 generally had fewer beds than did nursing homes built between 1985 and 1988.

E．(E) The more beds a nursing home has, the higher its occupancy rate is likely to be.
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