在日常检查保养时，须检查各传动轴有无裂痕，转动时有无（）。
参考答案：异常
下列镜头的组合中，__________时视野内所看到的物像最大。[ ]
A．目镜5×物镜4×
B．目镜10×物镜4×
C．目镜10×物镜10×
D．目镜16×物镜10×
—I don't know which to buy. Can you give me some advice?
—You _______ try on this T-shirt. It looks nice. [ ]
A. had not better
B. had better not
C. had better
D. had better to
