产后小便不通的主要病因病机为
A．气虚不摄B．膀胱气化不利C．湿热下注膀胱D．膀胱失约E．瘀血阻滞
参考答案：B
设计电气工程应遵守哪些原则？
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
