在其它条件不变的情况，加大变换炉激冷水流量能使变换催化剂温度（）。 A.下降 B.上

People from all over the world make friends_____66____writing letters. One way to find a pen friend is to _____67____a club. International Pen Friends started in 1967 and has over 300,000members(成员) in different countries. Their____68___member is eight years old, and their oldest member is over 80. Some people write to find out about life in another country, ___69___want to practice their English, or enjoy their hobbies. Stamp collectors, for example, write to people in different countries ___70__that they can collect the stamps on the letters they receive. Most people just enjoy making friends, and they invite their pen friends to visit them.

慢性肾功能不全时，继发甲状旁腺功能亢进的原因是（）

A.血钾升高

B.血磷升高，血钙降低

C.血肌酐升高

D.二氧化碳结合力降低

E.BUN升高

二战期间，国际反法西斯同盟正式形成的标志是《（）》的签署 。

镗床只能用来镗削加工孔。