输血可以传染的疾病有( )
A．疟疾
B．甲型肝炎
C．乙型肝炎
D．丙型肝炎
E．梅毒
参考答案：A,C,D,E
测温枪线如接反，插上热电偶，此时显示器（）灯亮。
In ______, the only element that can be deleted or removed is the one that was inserted most recently.
A．a line
B．a queue
C．an array
D．a stack
