绘制零件图的首要问题是对零件进行()进而确定合理的表达方案。
A、材料分析
B、形体分析
C、性能分析
D、尺寸分析
参考答案：B
_________ at the cinema, we found the film, ________ the 2008 Beijing Olympic Games, had begun.
A．On arrived; is set in
B．Upon our arrival; set in
C．As soon as we arriving; set in
D．When arriving; was set in
杂草种子库输出的主要途径有（）和死亡。
ng; was set in