轴报器出库前必须显示正常，轴与轴同侧温差不大于（）℃。
A.2
B.5
C.10
D.12
参考答案：B
His heart racing, and tears ____ his eyes, Jack carefully unlocked the box.
A．filled
B．filling
C．to fill
D．being filled
研究性说课是指借助说课，评价教师的教学水平、认定等级、比较优劣为主要目的的一种说课形式。( )
