PYB表示标准型液压圆锥破碎机。
参考答案:对
Jack always sleeps late on Sundays. I am sure he _______ when we get home.
A.is still sleeping
B.is to be sleeping
C.will still be sleeping
D.will have been sleeping
肠梗阻患者X线检查显示气液平面的最早时间是()
A.腹痛时
B.梗阻后3~6小时
C.发现明显腹胀后
D.发生第一次呕吐后
E.发病后12小时