使用下面哪种组织脱水剂脱水后不能用火棉胶包埋()
A.丙酮
B.环己酮
C.异丙醇
D.正丁醇
E.乙醇
参考答案:C
某人常食用方便面类食品,近日出现牙龈肿痛出血,皮肤瘀点或瘀斑,乏力,失眠,腹泻,他最有可能患的营养素缺乏病是()
A.维生素A缺乏病
B.烟酸缺乏病(癞皮病)
C.维生素B1缺乏病(脚气病)
D.维生素B2缺乏病(核黄素缺乏病)
E.维生素C缺乏病(坏血病)
It is now popular area of the Internet. The universe of hypertext servers that allow text, graphics, sound, and other multimedia files to be viewed together and navigated via hypertext links. It is ( ).
A.Telnet
B.WWW
C.E—mail
D.FTP