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.右侧位相
参考答案：B
Jane, _____my good friends, Tim and Jack. [ ]
A. this is
B. these is
C. these are
D. that is
地面审核规则库的各项规则共（）条。
A.40
B.80
C.114
D.124
