one and half months after B/L date, Mar. 8, 2007.

单选题

one and half months after B/L date, Mar. 8, 2007.

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单选题

A head on situation shall be deemed to exist at night when a power-driven vessel sees another power-driven vessel ahead and ___ .A. one sidelight and the masthead light are visibleB. the vessels will pass closer than half a mileC. both vessels sound one prolonged blastD. both sidelights and masthead light(s) are visible

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多选题

I’ll spend half of my holiday practicing English and ___ half learning drawing.

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单选题

，traffic circles，and bridges. Some studies suggest that straight，horizontal bars painted across roads can initially cut the average speed of drivers in half. However，traffic often returns to full speed within months as drivers become used to seeing the painted bars. Chevrons，scientists say，not only give drivers the impression that they are driving faster than they really are but also make a lane appear to be narrower. The result is a longer lasting reduction in highway speed and the number of tr

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材料题

of its path)around Mars was not correct.The scientists put the Orbiter on the wrong path.The Orbiter got too close and too hot.And it stopped functioning.Why didnt anybody see the mistake before it was too late? Many things contributed to the problem.One thing was that NASA scientists and mathematicians were working on two other spacecrafts at the same time.This was a challenge,and they were very tired from working long hours.The Mars Climate Orbiter cost$94 million to build.It also cost a lot

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