由正切函数周期公式得T=π23=3π2
故函数y=tg2x3的周期为3π2
I’ll remind him_______ what he has promised to us so that he won’t forget it.
A.about
B.in
C.of
D.in
下列组织中呈现嗜银性的是()
A.胶原纤维
B.弹力纤维
C.网状纤维
D.肌纤维
E.神经胶质纤维