肌电图与强度-时间曲线检查比较。
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I like winter best. it is very cold ,it is good for skating. I often go skating on Sundays my friends. When it snows , everything turns white. Trees and house are with thick snow. How beautiful the world !My friends and I like to make snowmen. Sometimes we make snowballs and them to each other. That’s a very interesting game. In winter we have a holiday, and the Spring Festival is in winter,too.
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计算（-2a2）3的结果为（ ）
A．-2a5
B．-8a6
C．-8a5
D．-6a6
诊断脑室周围白质软化，最重要的检查是
A.胸片
B.腹部平片
C.心脏彩超
D.头颅B超
E.头颅CT
美国1990年油污法要求去美国的（）以上的船舶应按照规定获取并持有“水域污染财务担保责任证书”。
A.100总吨
B.400总吨
C.300总吨
D.500总吨
试述便利店的分类？相应的标准是什么？