中心距一定的带传动，小带轮上包角的大小主要由（）决定。
A.小带轮直径
B.大带轮直径
C.两带轮直径之和
D.两带轮直径之差
参考答案：D
Which of the following makes the most appropriate title for the passage a. Cold-War Policies and the Tourism Industry b. The Characteristics of Political Tourism c. The Rise of Political Tourism d. The Latest Developments of Political Tourism
原发性肝癌最有效的治疗方法是
A．放射治疗
B．免疫治疗
C．抗癌药物局部治疗
D．冷冻治疗
E．手术治疗
