喷头流量系数分类，流量系数K=()的洒水喷头称为标准喷头。
A、55
B、80
C、115
D、155
参考答案：B
皮肤病发生的内因不包括（）。
A.热水烫洗
B.胎传
C.代谢障碍
D.内分泌紊乱
E.血液循环障碍
It has a long nose. 
It has a short tail.
It has big eyes.
They have long legs. 
It has short legs. 
They have big ears.