We were poor and we had no room ________.
A:to live
B:living in
C:to live in
D:live in
某企业决定投资不超过20万元建造A、B两种类型的温室大棚.经测算,投资A种类型的大棚6万元/个、B种类型的大棚7万元/个,那么建造方案有( )
下列各组能源中,均为不可再生能源的是 ()