高压水除鳞的原理?
参考答案:
利用高压的细水束快速喷射到出炉钢管的表面上,使钢管表面的氧化铁皮急剧冷却,收缩爆裂,在高压水速的冲击下剥落,从而达到祛除氧化铁皮的目的。
能够治疗跌打损伤,瘀血肿痛的药物是 ( )
A.菟丝子B.锁阳C.续断D.阳起石E.狗脊
The National Park, _____ with cherry tree flowers, looks as though it is covered with pink snow. [ ]
A. covering
B. covered
C. being covered
D. having covered