当皮带发出刺耳的尖叫声应（）。
A.装作没听见
B.检查有无坏托辊并作记号
C.停机检查
参考答案：B
Of the making of good books there is no end; neither ________ any end to their influence on man's lives.[ ]
A. there is
B. there are
C. is there
D. are there
急腹症的初期常表现为
A．正盛邪轻，病变以功能障碍为主
B．正盛邪实，局部病变和全身反应都很明显
C．正虚邪陷，疾病转为慢性或成严重危证
D．正虚邪恋，疾病转为慢性
E．邪却正复，疾病向愈
