材料含水率增加，导热系数随之增大，所以保温隔热材料使用时应防潮。
查看答案
材料的孔隙率越低，材料越密实，强度越高。
A. 对
B. 错
1. Johntoldusthat by theendoftheyearthey togetherfor thirty years.
A. would have been living
B. wouldhave lived
C. would have been lived
D. will have been living
2. He on this essay for twenty minutes but he only a hundredwords.
A. has been working/has written
B. has worked/has been writing
C. is working writes
D. works/is writing
3. We fine weatherforthe pastfew days.
A. have
B. are having
C. have had
D. have been having
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