什么是弹性聚氨酯灌浆材料

Consider a floating rate issue that has a coupon rate that is reset on January 1 of each year. The coupon rate is defined as one-year London Inter-bank Offered Rate (LIBOR) + 125 basis points and the coupons are paid semi-annually. If the one-year LIBOR is 6.5 percent on January 1, which of the following is the semi-annual coupon payment received by the holder of the issue in that year（）

A. 3.250%.

B. 6.500%.

C. 3.875%.

中央型肺癌早期的间接X线征象是（）

A.阻塞性肺不张

B.支气管扩张

C.局限性肺气肿

D.阻塞性肺炎

E.纵隔及肺门淋巴结增大

将燃着的金属钠伸入到盛有CO₂的集气瓶中，钠剧烈燃烧，发出强光，生成一种黑色固体（C）和一种白色固体（Na₂CO₃）．你认为下列说法中不正确的是（　　）

A．金属钠在反应中由游离态转变为化合态

B．该反应说明燃烧不一定要有氧气参与

C．该反应说明CO₂在一定条件下能支持燃烧

D．在反应4Na+3CO₂

导致感冒的主因是（）

A.风邪

B.寒邪

C.暑邪

D.燥邪

E.湿邪

请简述战略管理的三个层次，并对每一层次做一定的说明。