再生床层温度降低时,再生剂含碳量下降。
参考答案:错
、
A.该波沿x轴负方向传播
B.该时刻,c的加速度正在减小
C.该时刻以后,b比c先到达平衡位置
D.该时刻,b的速率比c的速率大
_____ does your brother watch TV? Every Saturday and Sunday.[ ]
A. How many
B. How often
C. How much
D. How long