单项选择题 Company A sells a batch of shirts, packed 12 of them in every box. Company B ordered 2400 pieces of shirts through telegraph. Company A wired back informing the unit price and saying that it did not have enough stock now but could arrange the full delivery in one month. Company B sent another telegram in reply which says: “we accept this price, but please repack 10 shirts in each box”. Company A did not reply. One month later, Company B came to pick up the goods, and Company A said that there was no consensus over the contract. As the contract was not formed, Company A refused to be liable for the breach of contract.  Which one of the following is correct

问答题 黑云杉主要产地为[填空1]和美国东部

多项选择题 凸轮机构设计的主要问题有( ) A. 凸轮机构的型式选择 B. 从动件运动规律选择与设计 C. 凸轮机构基本参数的确定 D. 凸轮轮廓曲线的设计