下列那些建筑应按二级负荷供电（）。A、建筑高度为32米的医院 B、十八层的普通住宅

将一个长2毫米的零件画在图纸上长10厘米，这幅图的比例尺是1：50．______．

在平面直角坐标系中，将二次函数y=（x-2）²+2的图象向左平移2个单位，所得图象对应的函数解析式为______．

国境卫生检疫法中已明确规定的"检疫传染病"是？

On a particular day the Wall Street Journal reports that the 91-day on-the-run U. S. Treasury bill is yielding 6 percent and the 30-year on-the-run U. S. Treasury bond is yielding 8 percent. In the market, default risk premiums average 2 percent, maturity risk premiums average 2 percent and liquidity risk premiums average 1 percent. If expected inflation is 3 percent, the real risk free rate of interest is:（）

A. -2%.

B. 0%.

C. 3%.