在B细胞上不出现下列哪个标志()
A.EB病毒受体
B.Ⅰ类MHC抗原
C.Ⅱ类MHC抗原
D.C3b受体
E.CD2抗原
参考答案:E
"I wish you’d look at me when I'm trying to speak to you!" the teacher said .
A.excitedly
B.pleasantly
C.hopefully
D.angrily
A ship that,at any time,operates seaward of the outermost boundary of the territorial sea is required to prepare,submit,and maintain a(n)().
A.synthetic plastic discharge plan
B.oil discharge plan
C.shipboard oil pollution emergency plan
D.vapor recovery procedures plan