以下有关专利权人在无效宣告程序中对专利文件进行修改的说法中，哪些是正确的 A．可以修

结账前要进行的检查包括（ ）。

A．检查本月业务是否全部记账，有未记账凭证不能结账

B．月末结转必须全部生成并已记账，否则本月不能结账

C．检查上月是否已结账，如果上月未结账，则本月不能结账

D．核对总账与明细账、主体账与辅助账、账务处理系统与其他子系统的数据是否已经一致，如果不一致，则不能结账

边长为a的正六边形ABCDEF在平面a内，PA⊥a，PA=a，则P到CD的距离为______，P到BC的距离为______．

制约国际关系发展变化的根本制约因素是______

A．政治文化因素
B．相互作用方式
C．力量对比关系
D．政治心理因素

在下列各国中，使用左手被视为不敬的是（）

A.沙特

B.土耳其

C.墨西哥

D.印度

John Klement is a soybean farmer who harvests 125000 bushels of soybeans annually. Klement’s fixed costs are $ 200000 and his variable costs are $ 5 per bushel. Soybeans are currently priced at $ 5.35 per bushel. Based on his estimates, Klement sees soybean prices being relatively stable for the next two years, then increasing to $7.00 per bushel due to increased demand from Japan. What action should Klement take Klement should:（）

A. shut down for two years and then restart his business. 

B. cut his production by 50% for the next two years and then resume full production. 

C. continue operating his business as usual.