故障研究的目的是()
A. 查明故障模式
B. 追寻故障机理
C. 探求减少故障的的方法
D. 提高机电设备的可靠程度和有效利用率
Tariffs are unambiguously pro-consumer and anti-producer.
A. 对
B. 错
Export tariffs are far less common than import tariffs.
A. 对
B. 错
Under a tariff rate quota, a higher tariff rate is applied to imports within the quota than those over the quota.
A. 对
B. 错