题目内容

机械制图国家标准规定了9种线型，图线的宽度分为粗细两种，粗线宽度应为细线的2倍。

A. 对
B. 错

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A3图纸幅面的尺寸（B×L）是210×297。

A. 对
B. 错

Which of the following prefix means yellow?

A. leuko-
B. erythro-
C. purpur-
D. xantho-

Which of the following prefix means small?

A. micro-
B. auto-
C. sub-
D. hyper-

Which of the following prefixes are opposite in meaning?

A. hyper- and hypo-
B. kilo- and centi-
C. semi- and hemi-
D. trans- and re-