耳气压损伤多发生在飞机下降阶段。
参考答案:对
Last year John earned________his brother did,who has a better position in a bigger company.
A.twice as many as
B.twice as much as
C.twice as more as
D.twice much as
靴形心见于下列哪种疾病()
A.高血压心脏病
B.肺心病
C.扩张型心肌病
D.二尖瓣狭窄
E.心包积液