A:are slowing disappearing
B:is slowly disappearing
C:are slowly disappeared
D:have slowly disappeared
What's she doing tomorrow? (回答问题)
____
鼎铛玉石,____,____,秦人视之,亦不甚惜。(《阿房宫赋》)
防止铁制品生锈的常用措施有____(写一点即可),也可在铁片表面镀上一层锌,表面会形成一层保护薄膜,其中含有Zn2(OH)2CO3.若该物质通过化合反应生成,试推断,反应物除了Zn、水和氧气外,还应有____.
南京长江大桥下层铁路全长6772m,其中江面正桥长1577m,一列火车长227m,测得火车全部在正桥上的时间为1min 30s.求: