题目内容
我国制图标准规定的A1大小的图纸幅面尺寸为
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绘图时，图纸上的图框线用线绘制。
一个完整的尺寸标注由哪些要素组成
The work initiated by American scientists has raised ethical concerns because it involves taking stem cells from human embryos that are (1)_______________________.
Oregon approves the "therapeutic cloning", making it possible for researchers at Oregon Health & Science University in Portland to (2)_______________________________. And the embryos they created could actually develop into (3)______________________________ .
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