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问题 单项选择题

当采用插入式振动棒时，浇筑层厚度应不超过振动棒作用部分长度的1.25倍，当用平板振动器时，其厚度应不超过( )mm。

A．100
B．150
C．200
D．250

答案

参考答案：C

单项选择题

The "Karat" marking on jewelry tells you what proportion of gold is mixed with other metals. If 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. If 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.

If a ring is stamped 24K, it has________.

A．204 parts of gold

B．24 parts of gold

C．two and four-tenths parts of gold

D．10 parts of gold
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单项选择题

口底血肿舌后移造成窒息的患者急救最合理的处理为

A．牵舌到口外

B．安置口咽通气道

C．血肿切开引流

D．托下颌角使下颌骨前移

E．给止血药
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