观察心脏左心房早期增大应选择何种最佳位置并服钡剂检查()
A.左前斜位相
B.右前斜位相
C.后前位相
D.卧位相
E.立位相
参考答案:B
Mother wanted to be a good provider, a role she _______ since her marriage to Father.
A.shoulders
B.has been shouldering
C.is shouldering
D.shouldered
当滚筒采煤机负载增加时,高压反而降低,这说明液压系统有漏损,泄漏处在主油路的低压侧,应停机处理。