问题
多项选择题
下列哪些因素可以提高气流拂过型蒸发室的效率（）
A.气液接触面积
B.增加湿度
C.载气流速
D.载气流距液面的距离
E.热能补充速率
答案
参考答案：A, C, D, E
搜题请搜索小程序“爱下问搜题”
下列哪些因素可以提高气流拂过型蒸发室的效率（）
A.气液接触面积
B.增加湿度
C.载气流速
D.载气流距液面的距离
E.热能补充速率
参考答案：A, C, D, E
| 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. |
This paragraph serves the consumer as
A．important buying information.
B．a challenge to buy more gold.
C．a debate over gold prices.
D．advice about buying silver.