路床不得有翻浆、弹簧（）等现象。
A.轮迹
B.起皮
C.波浪
D.积水
参考答案：B, C, D
If no other unbiased estimator of the same parameter has a sampling distribution with smaller variance, the estimator can be best described as:（）
A. efficiency.
B. unbiasedness.
C. consistency.
烫伤起水泡后仍可涂擦烫伤膏。
