一蜗杆分度圆直径为36mm，模数为3mm，则蜗杆直径系数为（）。
A.12
B.13
C.6
D.11
参考答案：A
The shop-assistant was straight with his customers. If an article was of _____ quality, he'd tell them so.
A．minor
B．humble
C．inferior
D．awkward
该患者的治疗方针是
A．胃肠减压，密切观察病情变化
B．中药制剂
C．补液抗炎
D．急诊手术
