轮重减载率是评定车辆行车安全的重要指标之一。
参考答案:对
She __ on the desk all the books she was carrying and ____ down for a rest. [ ]
A. lay; lay
B. laid; laid
C. laid; lay
D. lay; laid
根据学习策略适用的范围,可以把学习策略分为()和()两种。