工程中通风管道通常由（）材料制成。
A.钢板
B.硅酸盐
C.复合管材
D.橡胶
E.铜板
正确答案是ACD
Passage 4 Questions 16 to 20 are based on the following passage. I was supposed to have been a nice, church-going Swiss housewife, but I ended up a psychiatrist in the American Southwest for my bel
