真皮是决定羊毛好坏的皮层。（）
参考答案：对
.
Within a moment, its body _______ swiftly by the killer down into the depths of the sea.
A．was dragging
B．is dragging
C．was dragged
D．dragged
停运机泵要求，盘车按机泵旋转方向将轴转动（）度。
A.90
B.180
C.270
D.360
