凹版印刷印前准备应按生产通知单的要求检查（）的数量、质量和种类
A.冷却辊
B.干燥装置
C.刮墨刀
D.印版滚筒
参考答案：D
—Did you see Mr Smith when you were in France?
—No , when I _____ France, he had gone to China .[ ]
A. had arrived to
B. arrived to
C. had got to
D. got to
下列八进制数中哪个不正确（）。
A.281
B.35
C.-2
D.-45
