滞燃期越长，在滞燃期内喷入燃烧室的燃料就越多，所以滞燃期越长越好。
参考答案：错
下列哪项与放置宫内节育器无关
A．经量增多B．体重增加C．腰酸腹坠D．子宫穿孔E．感染
Georgia-Pacific has $1000 par value bonds with 10 years remaining maturity. The bonds carry a 7.5 percent coupon that is paid semi-annually. If the current yield to maturity on similar bonds is 8.2 percent, what is the current value of the bonds（）
A. $1123.89.
B. $569.52.
C. $952.85.
