肝脏的四叶是:()
A.左叶、右叶、方叶、尾叶
B.上叶、下叶、方叶、尾叶
C.前叶、后叶、方叶、尾叶
D.内叶、外叶、方叶、后叶
E.左叶、右叶、前叶、后叶
参考答案:A
判断呼吸衰竭的指标是指安静状态下呼吸空气时PaO2测定值小于()。
A.20mmHg
B.30mmHg
C.40mmHg
D.50mmHg
E.60mmHg
—Do you know Helen?
—Yes.She's a friend of mine,a very close friend________.[ ]
A. after all
B. in time
C. in fact
D. above all