下列实验现象描述正确的是( )
A.二氧化碳气体通入无色酚酞溶液,溶液变红色
B.细铁丝在氧气里剧烈燃烧,火星四射
C.红磷燃烧形成大量白雾
D.肥皂水滴入硬水中,产生较多的泡沫
答案:B
Speaking of all the songs he has written, I think this is probably his____one.
better-known B. well-known C. best-known D. most-known
制作工单时,工单对象能选哪几类()
A.设备
B.功能位置
C.备件
D.大型部件