毒麻药品要做到（）
A.双人双锁
B.双人单锁
C.单人单锁
D.单人双锁
参考答案：A
It is the teacher ____ taught me when I was a child ____ I am going to visit.
A．that; which
B．who; which
C．who; that
D．whom; that
消防电梯前室的门应采用（）。
A、甲级防火门
B、乙级防火门
C、丙级防火门
D、双向弹簧门
