列车运行,原则上以开往()的列车为上行。
参考答案:北京方向
Can you make sure ______ the gold medal?
A.where Maria had put
B.where had Maria put
C.where has Maria put
D.where Maria has put
破伤风病人,气管切开的指征主要是
A.呼吸中枢麻痹 B.肺部感染C.抽搐频繁,而又不易用药控制 D.吞咽困难,防止食物误吸E.腹直肌强直,呼吸受限