The Bermuda Triangle is one (51) the greatest mysteries of the sea. In this triangular area between Florida, Puerto Rico and Bermuda in Atlantic, ships and airplanes (52) to disappear more often than in (53) parts of the ocean. And they do so (54) leaving any sign of all accident or any dead bodies.
It is (55) that Christopher Columbus was the first person to record strange happenings in the area. His compass stopped working, a flame came clown from the sky, and a wave 100 to 200-feet-high carried his ship about a mile away.
The most famous disappearance in the Bermuda Triangle was the US Naval Air Flight 19. (56) December 5,1945, five bomber planes carrying 14 men (57) on a training mission from the Florida coast. Later that day, all communications with Flight 19 were lost. They just disappeared without a trace.
A. also
B. no
C. more
D. beside
| We all know that it is possible for
ordinary people to make their homes on the equator (道), although often they may
feel uncomfortably hot there. Millions do it. But as for the North Pole (北极)——we
know that it is not only a dangerously cold place, but that people like you and
I would find it quite impossible to live there. At the present time only the
scientists and explorers can do so, and they use special equipment. (76) {{U}}Men
have been travelling across and around the equator on wheels, on their feet or
in ships for thousands of years; but only a few men, with great difficulty and
in very recent time, have ever crossed the ice to the North Pole. {{/U}}So it may
surprise you to learn that, when traveling by air, it is really safer to fly
over the North Pole than over the equator. Of course, it is not true about
landings A. they do not land there B. there are no clouds at all C. they can cross the ice with special equipment D. it is very cold [多选题]中国南方电网有限责任公司(简称南方电网公司)是根据国家电力体制改革方案,于 2002 年 12 月 29 日正式挂牌成立的特大型国有电网企业,经营范围覆盖（）等省(区)。
A.广东 B.甘肃 C.浙江 D.云南 E.贵州 F.海南 [判断题]喉腔上方的前庭襞又称为假声带。( )
A.正确 B.错误 [单选题]一通三防中的三防是指防火、防尘和( )。
A.防火； B.防瓦斯； C.防煤尘； [单选题]>桥梁减速信号牌为黄底、黑色图案、( ),上部标明客车限制速度、下部标明货车限制速度。当客车或货车不需要限速是,标明客车或货车的允许速度。
A.蓝字 B.红字 C.黑字 D.白字 [单选题]用锉刀锉削时，使用的是锉刀的( )部分。
A. 锉刀面 B. 锉刀边 C. 锉刀舌 D. 锉刀底 [判断题]可动心轨宽20mm断面对应的翼轨垂直磨耗(含翼轨加高部分)超过4mm为轻伤。( )
A.正确 B.错误 [简答题]某地欲安装一油泵输送密度ρ为825kg/m3的油品已知液体在叶轮入口的流速ν为0.6m/s液体压力P1为114kpa液体在吸入管内的压头损失Σh为3.26m。试求泵的安装高度。（当地大气压Pa为100.3kpa重力加速度g=9.81m/s2）
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