Do you have any idea ________ A．when Mis

短文改错 (共10分,每小题1分,满分10分)

Last Sunday my father and I went fishing along a river. We found the water very dirty that we could hardly catch any fish in it. A lot of factories along the river always poured their waste water and rubbish straightly into the river, which made the river polluting. In this way most of the fish in the river was killed. Unless the rivers all over the country are polluted like this, no living things will be exist in the water. As we all know, environmental pollution do great harm to living things and human beings. Now more and more people have realized what serious this problem is. Our government is doing her best to take measure to fight against pollution. We expect that water in every river will be made cleaner and cleaner before long.

以热气体传递热能，使物料中的水分气化并被气流带走的干燥方法是（）

A．真空干燥

B．对流干燥

C．辐射干燥

D．介电加热干燥

E．传导干燥

外商参与打捞中国沿海水域沉船沉物，需经（）审批。

A、中华人民共和国海事局

B、中华人民共和国交通部

C、中华人民共和国外交部

D、国家海洋局

账务处理系统中会计科目如存在某明细科目，则该科目一定存在总账科目。 ( )

一般R-12冷媒多使用（）级冷媒压缩机润滑油。