工业上凡是受力复杂、负荷较大的重要工件大多数要经过（）的方式来制造。
A.焊接
B.铸造
C.冷加工
D.热加工
参考答案：D
If city noises_____from increasing, people _____ shout to be heard even at dinner. [ ]
A. are not kept; will have to
B. are not kept; have
C. do not keep; will have to
D. do not keep; have to
简述物资资源组织的条件。
