关于肋间神经阻滞的描述，下列哪些是正确的
A．肋间神经仅在肋角和腋中线区间是位于肋沟内的，其他区间都是走行于肋间隙中，在肋角和腋中线之间行肋间神经阻滞的效果较确切
B．两侧肩胛冈内端连线过第三胸椎棘突，两侧肩胛骨下角连线过第七胸椎棘突，第十二肋与骶棘肌外缘交点连线过第一腰椎棘突
C．肋间神经阻滞一般于肋骨下缘稍上方垂直进针，抵肋骨后将针尖轻轻移向肋骨下缘，回抽无血无气即可注药
D．肋间神经阻滞一般于肋骨上缘稍下方垂直进针，抵肋骨后将针尖轻轻移向肋骨上缘，回抽无血无气即可注药
E．肋间血管神经束内自上而下的排列为静脉、动脉和神经
参考答案：A, B, C, E
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| Canada is the second largest country is the world. It is over 7,000 kilometres from the __1__ coast to the east. It __2__ six time zones. __3__ it is 9 a. m. in Vancouver on the west coast,it is 1:30 p, m. in St John's on the east coast. English and French __4___ the two main languages in Canada. About 60 percent of __5 _ people speak English, and about 25 percent speak French. More __6_ 70 percent of its population live in cities near the US border (边缘). Ottawa is the capital. Every year millions of tourists go there to __7__ museums and take part in the cultural activities. Toronto is the largest city of the country __8__ about 2. 5 million people. Montreal is __9_ second biggest French-speaking city in the world. The maple leaf (枫叶) is the national symbol of Canada. The Canadian flag has a red maple leaf on a red __10_ white background (背景). | ||||
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