单项选择题

During the winter months，the southeast trade winds are（）.

A.stronger than during the summer months
B.weaker than during the summer months
C.drier than during the summer months
D.wetter than during the summer months

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单项选择题

During the month of October the Sun’s declination is（）.

A.north and increasing
B.north and decreasing
C.south and increasing
D.south and decreasing

单项选择题

During the manufacture of line，yarns are twisted together in the（）.

A.opposite direction from which the fibers are twisted together to form strands
B.same direction the fibers are twisted to form strands
C.opposite direction from which the fibers are twisted together to form the line
D.opposite direction from which the fibers are twisted together forming cables

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During the day，a vessel picking up a submarine cable shall carry（）.

A.three shapes，the highest and lowest shall be red balls，and the middle shall be a white diamond
B.two black balls
C.three shapes; the highest and lowest shall be black balls，and the middle shall be a red diamond
D.three shapes; the highest and lowest shall be black balls and the middle shall be a black diamond