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【简答题】
Two weeks before 1) ____________(what), people who are out of home for work start to come back to 2)____________(where) from other cities by flight, train or bus to 3)________ (do what) the festival with their family members. Usually within 4) ________ (how long) after the festival, people will 5)____________(do what) to the cities in which they work. If you 6)________ (do what) to visit China during Chinese New Year, in order to 7)________ (do what) tickets being sold out, you’d better book it 8)____________(when). Besides, the air fares will be more 9)____________ (how) than usual. Some restaurauts may be back to their hometown to spend New Year time with their families, so some restaurants may close business for the time of Chinese New Year. In some 10)___________ cities, hotel price may be higher than usual.
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【单选题】We generally take the convention of safety of life at sea adopted in 1974 as a completely new convention, the reason is _____.
A.
it included the amendments agreed up until that date
B.
it included none of the amendments agreed up until that date
C.
it required two thirds of the Parties’ acceptance for a amendment to enter into force
D.
it included a tacit acceptance procedure
【单选题】下列自动喷水灭火系统中,喷头常开的是()
A.
湿式自动喷水灭火系统
B.
干式自动喷水灭火系统
C.
雨淋自动喷水灭火系统
D.
预作用自动喷水灭火系统
【单选题】下列自动喷水灭火系统中,喷头常开的的是( )。
A.
雨淋自动喷水灭火系统
B.
干式自动喷水灭火系统
C.
湿式自动喷水灭火系统
D.
预作用自动喷水灭火系统
【单选题】下列自动喷水灭火系统中,喷头常开的是()
A.
预作用自动喷水灭火系统
B.
湿式自动喷水灭火系统
C.
干式自动喷水灭火系统
D.
雨淋自动喷水灭火系统
【单选题】肝固有动脉()
A.
发自腹腔干
B.
在肝十二指肠内行于胆总管的左侧
C.
是肝的功能血管
D.
胃左动脉为其分支
E.
胃网膜右动脉为其分支
【简答题】证明折射光束的方向是等光程方向.即证明图1-14中 L(A 1 B 1 D 1 )=L(A 2 B 2 D 2 ).
【简答题】如图,已知∠1=∠2,∠A=∠D,证明:∠E=∠C
【单选题】下列自动喷水灭火系统中,喷头常开的的是( )。
A.
雨淋自动喷水灭火系统
B.
湿式自动喷水灭火系统
C.
预作用自动喷水灭火系统
D.
干式自动喷水灭火系统
【简答题】证明  若Dξ=0,则{x=Eξ}=1.
【单选题】二次风门的主要作用是()。
A.
使燃烧有足够的空气
B.
使燃料具有足够高温度
C.
以使燃烧有足够时间
D.
使空气与燃料组分混合
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