灰渣颗粒的硬度取决于()和燃烧方式,如果燃用的C.稳定,一般这个因素是不变的。
A.煤的含量;
B.煤的含碳量;
C.煤种;
D.煤质。
参考答案:C
People say, “Guilin’s scenery is superb in the world.” It was not until I visited the place that I found it really worthy of the _______.
A.imagination
B.status
C.reputation
D.assessment
为了节约能源,照明光源不宜采用()。
A.细管径直管径直管荧光灯
B.紧凑荧光灯
C.高压钠灯
D.普通白炽灯