循环水电导率升高的原因是什么?
参考答案:
1.补水电导率升高
2.系统换热器出现泄漏
3.系统长时间未进行补水
单词拼写
小题1:We need ___________ (能量) to live.
小题2:Our government is paying more attention to ______(农业)development.
小题3:He lost his b_____ and fell over.
小题4:"You mustn’t leave the house without my p ." The angry mother said to her son.
小题5:I ____________(真诚的) hope that you and your father will be well again soon.
土方工程对土料有严格的要求,以下( )土料不能用作填方。
A.淤泥质土
B.碎石土
C.有机质含量<8%的土
D.耕土