读“2010年北京市常住人口年龄金字塔”图，依据图像及所学知识，完成下列问题。关

所谓教育，主要是指法制教育，要求被教育者必须懂法、守法，不得以任何借口逃避、拒绝教育。( )

Concern for family values is reducing among younger Japanese as they pursue an inner world of private satisfaction. Data collected by the Japanese government in 1993 show that only 23% of Japanese youth are thinking about supporting their aged parents, in contrast to 63% of young Americans. It appears that many younger-generation Japanese are losing both respect for their parents and a sense of responsibility to the family. Experts attribute the change to Japanese parents’ over-spoiling of their children, material plentifulness, and growing concern for private matters. The shift toward individualism among Japanese is most striking among the very young. According to data provided in 1991, 50% of Japanese youth aged 16 to 19 can be labeled "self-centered", compared with 33% among those aged 25 to 29. To earn the label, the young people responded positively to such ideas as "I would like to make decisions without considering traditional values" and "I don’t want to do anything I can’t enjoy doing".

篮子里装有不多于500个苹果，如果每次二个、每次三个、每次四个、每次五个、每次六个地取出，篮子中都剩下一个苹果，而如果每次七个地取出，那么没有苹果剩下，篮子中共有多少个苹果( )

A．298

B．299

C．300

D．301

箱体零件工作能力的主要指标是（），其次是强度和抗振性能；当同时用作滑道时，滑道部分还应具有足够的耐磨性。此外，对具体的机械，还应满足特殊的要求，并力求具有良好的工艺性。

A.塑性

B.硬度

C.刚度

D.韧性

蒸汽供给异常可能的原因是（）。

A、燃料供应故障

B、动力装置故障

C、水供应故障

D、急停按钮动作