从不同的方向观察同一物体时，可能看到不同的图形，我们把从正面看到的图叫（ ），从（ ）面看到的图叫做左视图，从上面看到的图叫做（ ）．
主视图；左；俯视图。
I had a very unusual experience on小题1:星期天。At around ten o’clock in the morning, I was walking down the street when a UFO landed in 小题2:f_____ of me. You can imagine how小题3:奇怪的it was! An alien got out and walked down the Center Street. I 小题4:跟随it to see where it was going, and I was very surprised when it went into a souvenir shop. While it was looking at the souvenirs, the assistant called the 小题5:p_______.
等渗性脱水，哪项是错误的
A．临床最多见B．水钠急剧丧失C．血清钠明显降低D．有轻度口渴E．尿少、黏膜干燥
