胎心率早期减速的原因是（） ["A.胎头受压","B.脐带缠绕","C.胳静脉暂时受压","D.脐带受压","E.胎盘功能减退"]
广藿香（） ["草酸钙砂晶和方晶","草酸钙针晶及片状结晶","草酸钙簇晶","草酸钙砂晶及小方晶","草酸钙棱晶及针晶"]
过期妊娠，B型超声提示羊水过少，胎儿电子监护时可能出现（） ["A.早期减速","B.晚期减速","C.变异减速","D.基线胎心率有变异","E.周期性胎心率加速"]
薄荷（） ["不等式气孔","不定式气孔","平轴式气孔","直轴式气孔","环式气孔"]
疑有脐带受压或胳带绕颈，胎儿电子监护时可（） ["A.早期减速","B.晚期减速","C.变异减速","D.基线胎心率有变异","E.周期性胎心率加速"]
为提高大气污染治理力度，到2013年，长沙将淘汰所有黄标公交车和什么车。
