固体料层水分较多、碳酸盐较多、料层孔隙率较小,则传热前沿速度较()
A、大
B、小
C、不变
D、无关
参考答案:B
Our book's not ______ be published until December. [ ]
A. due to
B. planned to
C. owing to
D. thought to
生物防治的措施有()
A.以虫治虫
B.以菌治虫
C.以菌治病
D.以药治病