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【判断题】
在垄断竞争中，有许多厂商生产有差异的产品A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】—Is this computer ______, Mike? —No, it's not mine. I think it's ______. [ ]
A.
your; Lily's
B.
yours; Lily
C.
yours; Lily's
D.
your; Lily
【简答题】DDR400内存的物理工作频率为( )。
【单选题】Taking the train across town is quicker than taking the bus. Taking the bus across town is slower than driving a car. Therefore, taking the train across town is quicker than driving a car.
A.
T
B.
F
C.
U
【单选题】不属于潜污泵操作前准备工作是（）。
A.
开机前检查泵站内是否有较大的固态杂质，如有则需及时清除以避免泵的损坏
B.
若排污泵或控制箱检修过，在起动之前还应检查电源电压是否与电机铭牌上标注的电源电压是否一致
C.
检查其密封装置是否完好
D.
检查排污口两米内是否有阻隔物
【单选题】Not until he retired from teaching three yeas ago ________ having a holiday abroad.
A.
he had considered
B.
had he considered
C.
he considered
D.
did he consider
【单选题】Not until he retired from teaching three years ago ________ having a holiday abroad.
A.
he considered
B.
he had considered
C.
had he considered
D.
did he consider
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