制冷压缩机应先开机，后开水阀（水冷式冷凝器）或风机（风冷式冷凝器）。（）
参考答案：错
that we can't get the necessary equipment , we will have to give up the experiment. [ ]
A. If
B. Supposed
C. Provide
D. Assuming
下列家庭垃圾中适合用于堆肥法处理的是
A．废电池
B．瓜果壳
C．旧报纸
D．塑料瓶
