液压系统的油温一般规定不大于（）℃，油温过高时，应立即接通冷却水。
A.35
B.45
C.55
D.65
参考答案：C
一长方形操场的宽是50米，长是宽的2倍。 我沿着这个操场四周跑了3圈，跑了多少米？
—When did she get injured?
—It was at midnight rain was pouring down.[ ]
A. where
B. that
C. what
D. when
