下列哪种化学药物常用于治疗异位妊娠
A．顺铂
B．环磷酰胺
C．甲氨蝶呤
D．长春新碱
E．放线菌素D(更生霉素)
参考答案：C
At first he refused to admit his guilt but when he was shown the evidence he ______ and confessed (坦白).
A．broke down
B．lay down
C．got down
D．put down
矿用隔爆型电钻变压器综合保护装置应体积小，重量轻，并且保护功能要齐全。（）
