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【单选题】
交流二元二位继电器的“二元”是指有（ ）。A.
轨道线圈和局部线圈
B.
轨道铁心和局部铁心
C.
两种状态
D.
两个电磁系统
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反馈参考答案：
举一反三
【单选题】听力原文： Years ago before there were refrigerators, an icehouse was a building used for storing ice. The first icehouses were in the cellars of farmhouses. Pieces of ice, mixed with snow and meadow grass...
A.
Separate houses were built for storing ice.
B.
Double walls were built in icehouses to keep cool.
C.
Blocks of ice were packed with weed in icehouses.
D.
Ice was put into icehouses in winter.
【简答题】在世界四大洋中，面积最大的是______洋，面积最小的是_____洋。
【单选题】On the morning of November 1st, 2,011, the scientists were seated at tables and had their eyes _____ on the scene of the launch of the Shenzhou VIII spaceship. [ ]
A.
fixed
B.
fix
C.
fixing
D.
being fixed
【单选题】听力原文： Years ago before there were refrigerators, an icehouse was a building used for storing ice. The first teahouses were in the cellars of farmhouses. Pieces of ice, mixed with snow and meadow grass...
A.
Separate houses were built for storing ice.
B.
Double walls were built in icehouses to keep cool.
C.
Blocks of ice were packed with hay in icehouses.
D.
ice was put into icehouses in winter.
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