劳动法律责任由( )保证实施。A．行政机关 B．公安部门 C．劳动保障部门 D．国

下列变化属于物理变化的是（　　）

A．CO₂在自然界里的循环

B．农家肥料的腐熟

C．活性碳使红糖脱色

D．煤燃烧

下图为A、B两个相同级别中心地的服务范围。有关王明家购物的选择说法，正确的是

A、一定选择A中心地

B、一定选择B中心地

C、一般选择A中心地

D、一般选择B中心地

You are a project manager of a small construction project. Your project was budgeted for US $72,000 over a six week period. As of today, you’ve spent US $22,000 of your budget to complete work that you originality espected would cost US $24,000. According to your schedule, you should have spent US $30,000 by this point. Based on these circumstances, you project could be BEST described as （）.

A．under budget

B．over budget

C．on budget

D．need more info

叙述导入空气和循环系统漏入空气有何差别？

(2003，30)不动产抵押与动产质押的根本区别在于( )的不同。

A．担保的效力范围

B．实现方式

C．设定方式

D．标的物及其占有状态