扩散相遇时形成白色烟环。下列关于物质甲、乙的判断正确的是:
A.甲是浓氨水,乙是浓硫酸
B.甲是浓盐酸,乙是浓氨水
C.甲是浓氨水,乙是浓盐酸
D.甲是浓硝酸,乙是浓氨水
答案:C
Had Tom studied harder, he ________ the exam.
A.must have got through
B.would have got through
C.would get through
D.could get through
肺癌空洞、肺结核空洞及肺脓肿空洞鉴别最主要的方法是
A.病史、症状、体征B.胸部正、侧位照片加体层照片C.放射性核素扫描D.痰细胞学和细菌学检查E.以上都不是