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【单选题】
下面不是造成“塔下黑”的原因的一项为A.
天线过高
B.
天线规格不达标
C.
功率过高
D.
下倾角过小
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反馈参考答案：
举一反三
【单选题】— Mike, is this your eraser? — No, it’s not ______. Maybe it’s __________.
A.
my; Lily’s
B.
me; Lily
C.
mine; Lilys’
D.
mine; Lily’s
【单选题】Not until he retired from teahcing three years ago ________ having a holiday abroad.
A.
he had considered
B.
had he considered
C.
he considered
D.
did he consider
【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】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.
True
B.
False
C.
Uncertain
【单选题】下列技术中，（）不属于特高压交流输电在外绝缘配合方面的关键技术。
A.
有效控制潜供电流
B.
深度抑制操作过电压水平
C.
采用复合绝缘子和套管
D.
模拟高海拔绝缘特性
【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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