如果a<b,则下列各式中成立的是[ ]
A.a+4>b+4
B.2+3a>2+3b
C.a﹣b>b﹣6
D.﹣3a>﹣3b
答案:D
For nearly 50 years, Spock has been a ______ author writing 13 books including an autobiography and numerous magazine articles.
A.prevalent
B.precautious
C.prospective
D.prolific
以下对间接抗球蛋白试验叙述不正确的是:()
A.一种试管内红细胞凝集方法
B.主要检测IgM抗体
C.是抗体测定最敏感的技术
D.可用于血型抗原鉴定
E.可用于血型抗体鉴定