自动空调系统可以实现多种出风量的自动控制。()
参考答案:对
He studied as hard as he could _____ to enter a good college.
A.hope
B.to hope
C.hoping
D.hoped
可确诊食道阻塞的方法是()
A.吞咽障碍
B.食道视诊或触诊
C.胃管探针
D.X光检查有异物阴影
E.触摸