气管插管的并发症不包括（）。
A.误入食管
B.声带损伤
C.单侧通气
D.气胸或纵隔气肿
E.一过性心律不齐
参考答案：D
Americans eat_____vegetables per person today as they did in 1910.
A．more than twice
B．as twice as many
C．twice as many as
D．more than twice as many
韶山4型电力机车由（）通风支路。
A.2条
B.3条
C.4条
D.5条
