单项选择题

数控机床中，坐标轴是按右手卡笛尔直角坐标系定义的。 A. 对 B. 错

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多项选择题

How can you revise the organization of your paper? （） A. Do key terms run through your whole paper? B. Is the beginning of each section and subsection clearly signaled? C. Does each major section begin with words that signal how that section relates to the one before it? D. Is it clear how each section relates to the whole? E. Is the point of each section stated in a brief introduction (preferably) or in its conclusion? F. Do terms that unify each section run through it?

多项选择题

1.热流道注射模可以通过（）方式保持流道中的凝料不发生冷却凝固。
A 冷却
B 加热
C 喷脱模剂
D 绝热