The designer should consider these in selecting and economical material and a process that is best suited to the product.
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materials are further classified as organic or inorganic substances.
Iron has little commerical use in its1 state, but when combined with other elements into various 2 it becomes the leading engineering metal.
下列情形中，那种情况应视为承诺仍然发生效力。
A. 撤回承诺的通知迟到，要约人未将迟到的情况立即通知对方
B. 承诺在承诺期限界满后到达要约人
C. 撤回承诺的通知先于承诺通知到达要约人
D. 撤回承诺的通知与承诺的通知同时到达要约人
一般情况下，如果接到要约的一方不在规定的期限内答复，应视为对要约的
A. 拒绝
B. 承若
C. 违约
D. 要约
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