裸甲藻在肥水池中可大量繁殖成水华,使池水呈蓝绿色,是()的优良的天然饵料,对渔业生产有利。
A.鲤鱼
B.鲫鱼
C.鲢鱼
D.鳙鱼
参考答案:C
I think people must have found it quite_____delight when colour TV was first broadcast in___1920s.
A.不填; the
B.a; 不填
C.a; the
D.不填; 不填
土壤中热量交换的主要方式是()
A.辐射热交换
B.分子热传导
C.对流热交换
D.潜热交换