成反比例的两种量在变化过程中，一种量扩大，另一种量缩小，变化方向应该相反；
故选：B．
In 1986, the Chinese government ________ a law stating that by the year 2000 every Chinese child would have nine years of compulsory education.
A．impressed
B．introduced
C．interrupted
D．instructed
氮肥的吸湿性大小顺序是（）。
A、NH4NO3>NH4HCO3>尿素>（NH4）2SO4>NH4Cl
B、NH4NO3>NH4HCO3>尿素>NH4Cl>（NH4）2SO4
C、NH4HCO3>NH4NO3>尿素>（NH4）2SO4>NH4Cl
D、NH4HCO3>NH4NO3>尿素>（NH4）2SO4>NH4Cl
