细牙螺纹属于（）螺纹。
A.英制
B.普通
C.梯形
D.圆柱管
参考答案：B
Simon was born _____ the evening of July in 2004.[ ]
A. in
B. on
C. at
D. from
黄龙汤的功用是（）
A.清热泻火，凉血解毒
B.攻下热结，补气养血
C.润肠泻热，行气通便
D.温肾益精，润肠通便
E.泻热通便，滋阴益气
