形成高带免疫耐受的细胞是()
A.B细胞
B.T细胞
C.T和B细胞
D.单核细胞
E.NK细胞
参考答案:C
On the annual International Volunteers Day, the world ______ the work of millions of people who give their time to help others.
A.abolishes
B.assesses
C.accompanies
D.acknowledges
反应3H2(g) + N2(g) 2NH3(g) ΔH = -46.19 kJ. mol—1,关于这个反应的平衡常数K,下列说法正确的是( )
A.随温度升高K增加
B.随压强升高K增加
C.随温度升高K减小
D.随压强升高K减小