锅内水循环的形成()
A.只有当锅炉有上升管和下降管时才能实现
B.只要有上升管即可
C.只要有下降管即可
D.只要受热面的受热强度有差异就可实现
参考答案:D
— Can we let these new graduates take on the task?
— I'm afraid not. While they are energetic and ambitious, ____ of them seems to be suitable for this
demanding job.[ ]
A. no one
B. anyone
C. none
D. few
判罚手球犯规的部位是手腕以下。