工程制图习工程制图习题集答案高题集答案高等教育出版等教育出版社社P7 P8 (5) (6) (7) (8) P9 P13 P14 P15 P16 (2) (1) P18 P18 (4) (3) P19 (2) (1) P19 (4) (3) P21-(1) P21-(2) P21-(3) P21-(4) P44-(1)P44-(2)P45-(3)P45-(4)P46-(5)P46-(6)P47-(7)P47-(8)P48-(9)P48-(10)P49-(11)P49-(12)P50-(13)P50-(14)P51-(15)P51-(16)P52-(17)P52-(18)P57-(1)P58-(2)P59-1BABAP60-2P61-(1)P61-(2)P62-(3)P62-(4)P63-2P64-3P65-4P66-5P67-(1)P67-(2)P68-(3)P68-(4)P69-7P69-8P70-9P71-10P71-11P72-12P72-13P73-14P73-15P74-(1)P74-(2)P75-(3)P75-(4)P76-(5)P77-(1)P78-(2)P79-(3)P79-(4)注意问题:注意问题:注意问题:注意问题: