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【简答题】
在Rt△ABO中，∠ABO=30°，BO=4，分别以OA、OB边所在的直线建立平面直角坐标系，D为x轴正半轴上一点，以OD为一边在第一象限内作等边△ODE. （Ⅰ）如图①， 当E点恰好落在线段AB上，求点E的坐标； （Ⅱ）在（Ⅰ）问的条件下，将△ODE在线段OB上向右平移（如图②），图中是否存在一条与线段 始终相等的线段？如果存在，请指出这条线段，并加以证明；如果不存在，请说明理由. （Ⅲ）若点D从原点出发沿x轴的正方向移动，设点D到原点的距离为x，△ODE与△AOB重叠部分面积为y，请直接写出y与x的函数关系式，并写出自变量x的取值范围.
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A.
PT＞Ps＞Pi＞P
B.
PT＜Ps＜Pi＜P
C.
Ps＜PT＜Pi＜P
D.
Pi＜PT＜Ps＜P
【单选题】空压机的等温理论功率Pt、绝热理论功率Ps、指示功率Pi、轴功率P之间的大小关系是
A.
Pt＞Ps＞Pi＞P
B.
Pt＜Ps＜Pi＜P
C.
Ps＜Pt＜Pi＜P
D.
Pi＜Pt＜Ps＜P
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【单选题】空压机的等温理论功率Pt、绝热理论功率Ps、指示功率Pi、轴功率P之间的大小关系是（）
A.
Pt﹥Ps﹥Pi﹥P
B.
Pt﹤PS﹤PI﹤P
C.
Ps﹤PT﹤PI﹤P
D.
Pi﹤PT﹤PS﹤P
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