下列属于电驱动蒸汽压缩制冷循环基本设备的是（）。
A．压缩机；
B．蒸发器；
C．蓄冰装置；
D．节流机构
参考答案：B
She showed the visitors around the museum，the construction ________ had taken more than three years.(2011·江西)
A．for which
B．with which
C．of which
D．to which
烟花爆竹产品中禁止使用（）原材料。
A.高氯酸钾
B.氯酸钾
C.硝酸钾
D.苯钾酸钾
