沤肥
参考答案:
用植物茎杆、绿肥、山青湖草等植物性物质与泥炭、人畜粪尿、化学氮肥和石灰等材料混合堆积、经嫌气微生物分解腐熟而成的肥料。
John invited approximately 40 guests to his wedding, most of _______ are family members.
A.whom
B.that
C.them
D.which
下列化学方程式符合题意并书写正确的是 [ ]
A.实验室制取氧气
B.双氧水制氧气
C.镁在氧气中燃烧
D.水通电分解