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【单选题】
A revised print of a chart is made ______.A.
after every major hydrographic survey of the area covered by the chart
B.
when there are numerous corrections to be made or the corrections are extensive
C.
when a low-stock situation occurs and minor corrections are made
D.
every two years to update the magnetic variation information
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皮皮学刷刷变学霸
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【判断题】The combination of numbers and letters like 15C on the boarding pass represents the passenger's seat number.
A.
正确
B.
错误
【单选题】The windchill factor, the combination of low temperature and wind speed, strikingly increases the degree of cold felt by a person who is outdoors.
A.
effectively
B.
remarkably
C.
certainly
D.
unquestionably
【多选题】The philosophy of TCM is based on the combination of
A.
five elements theory
B.
yin-yang theory
C.
disease cause theory
D.
health preservation theory
E.
meridian theory
【单选题】下列有关对金属和金属材料的认识不正确的是 （ ）
A.
铁有良好的导热性，常用来制作炊具
B.
合金的硬度一般小于成分金属的硬度
C.
废旧电池中的回收，可减少对环境的污染
D.
铝表面易形成致密的氧化膜，可阻止铝进一步被氧化
【单选题】If the combination of goods consumed at point C is preferred to combination D then
A.
point C is on a higher indifference curve.
B.
point C is on the same indifference cure but at a point where the vertical axis value is greater than point D's vertical axis value.
C.
point C is on a lower indifference curve.
D.
point C is on the same indifference curve but at a point where the horizontal axis value is greater than point D's horizontal axis value.
【单选题】下列关于金属材料的说法不正确的是
A.
常温下，铝能与空气中的氧气反应，在其表面生成致密的氧化铝薄膜
B.
铁在干燥的空气中容易生锈 硬铝
C.
硬铝 铝合金 的硬度大于纯铝
D.
金属资源的回收利用既保护了环境，又节约了金属资源
【简答题】SS4G 机车库用转换开关是 2 0QP 和( )。
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