给动物吸入CO2气体引起呼吸加强的主要机制是
A.刺激外周化学感受器B.刺激中枢化学感受器C.直接抑制呼吸中枢D.直接刺激呼吸中枢E.直接刺激脑桥呼吸调整中枢
参考答案:B
肝郁气滞型腹痛,治疗首选()。
A.柴胡疏肝散
B.逍遥散
C.良附丸合正气天香散
D.木香顺气散
E.小建中汤
It’s already 10 o’clock. I wonder how it ____that she was 3 hours late on such a short trip.
A.came across
B.came out
C.came up
D.came about