水动力油气藏是指储集层中被高势能面、（）遮挡单独或联合封闭而形成的区域并聚集油气后形成的油气藏。
参考答案：非渗透性
在Excel中可用组合键和键“shiftctrl+；”输入当前的时间。
The doctor was ______ immediately the little boy fell off a ladder and hurt himself.
A．asked for
B．sent for
C．waited for
D．cared for
