下列何种先心病可出现周围血管征
A．肺动脉狭窄B．法洛四联症C．动脉导管未闭D．房间隔缺损E．室间隔缺损
参考答案：C
Armed police and railway workers were removing snow from the track to _______ a train stuck near Jining in Inner Mongolia.
A．recover
B．free
C．protect
D．clear
海运提单表面注明同一船只、同一航次及同一目的地的多次装运，视为分批装运。（）
