问题
单项选择题
在宽度小于3m的内走道顶层上设置探测器时，探测器至墙壁梁边的水平距离不应小于 ( )m。
A．2
B．1.5
C．1
D．0.5
答案
参考答案：D
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在宽度小于3m的内走道顶层上设置探测器时，探测器至墙壁梁边的水平距离不应小于 ( )m。
A．2
B．1.5
C．1
D．0.5
参考答案：D
| The "Karat" marking on jewelry tells you what proportion of gold is mixed with other metals, ff 14 parts of gold are mixed with 10 parts of base metal, the combination is called 14-Karat (14K) gold. The higher the Karat rating, the higher the proportion of gold in the object. The lowest Karat gold that can be marketed in the United States is 10-Karat gold. Jewelry does not have to be marked with its Karat quality, but most of it is. ff there is a Karat quality mark, next to it must be the U.S. registered trademark of the person or company that will stand behind the mark, as required by the National Gold and Silver Stamping Act. |
The Stamping Act is
A．a regulation for tax.
B．role of law.
C．a law that makes such stamping mandate.
D．an implement.