开胸手术麻醉状态下V/Q比率异常将造成哪些病理改变()
A.静脉血掺杂增多
B.低氧血症
C.血氧饱和度下降
D.循环功能障碍
E.二氧化碳积蓄
参考答案:A, C, E
句型转换。
1. She did her homework at school yesterday. (改为一般疑问句)
____ she ____ her homework at school yesterday.
2. He said, "I am a new student. " (改为间接引语)
He said ____ a new student.
3. He asked me, "How will you get to the party?" (改为间接引语)
He asked me ____ ____ ____ ____ to the party.
4. My brother watched the match last night. (就画线部分提问)
____ ____ ____ brother ____ the match?
5. Is the girl good at dancing? (改为同义句)
____ the girl ____ ____ ____ dancing?
某运输企业投资400万元,购买了20辆额定吨位为5吨的货车,预计年固定成本400万元,运营中的单位变动成本为0.2元/吨公里;公司预计年度盈亏平衡点的货物周转量为1500万吨公里,目标利润为50万元。 根据以上资料,回答下列问题。
采用损益平衡定价法制定运输价格,关键的问题是( )。
A.确定适合的企业目标利润
B.准确预测货物周转量
C.购买价格适中的运输车辆
D.降低运营成本
E.提高运输车辆技术水平