在电镜下所见代表完整的乙型肝炎病毒颗粒的是
A．特异的DNA多聚酶
B．HBcAg
C．管形颗粒
D．Dane颗粒
E．双股DNA
参考答案：D
My English teacher said I was ____ at reading than listening.
A．good
B．well
C．better
D．best
己烯雌酚应在何种条件下保存
A．密封B．遮光C．防潮D．密封、遮光E．密封、防潮
