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【单选题】
—My favorite TV _______ is A Bite of Chinese (舌尖上的中国). —We like it, too. My mother often cooks delicious food after watching it.
A.
instruction
B.
guidebook
C.
entertainment
D.
program
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举一反三
【单选题】UPS在输入电源、旁路或电池供电之间任意切换,其转换时间均应不小于()。
A.
1ms
B.
2ms
C.
3ms
D.
4ms
【单选题】When we got to the station, the train .
A.
will have left
B.
left
C.
has left
D.
had left
【单选题】When we got to the scene of the incident, we found that the police were firing shots and using teargas to______the crowd that had gathered around the building.
A.
dispose
B.
dislocate
C.
disintegrate
D.
disperse
【单选题】有一外径为18mm的无缝钢管,管内通冷冻盐水,为减少冷量损失,在管外包一层热导率λ=0.18W/(m·℃)的石棉,保温层外壁与空气对流给热系数α=10W/(m2·℃),比较石棉厚为5mm和8mm时的冷量损失()*
A.
5mm时损失较大
B.
8mm时损失较大
C.
一样大
D.
不确定
【单选题】在输入电源、旁路或电池供电之间任意切换,UPS的转换时间均应小于( )。
A.
4ms
B.
2ms
C.
6ms
D.
1ms
【单选题】有一外径为18mm的无缝钢管,管内通冷冻盐水,为减少冷量损失,在管外包一层热导率λ=0.18W/(m·℃)的石棉,保温层外壁与空气对流给热系数α=10W/(m2·℃),比较石棉厚为5mm和8mm时的冷量损失()*
A.
5mm 时热损失较大
B.
8mm 时热损失较大
C.
一样大
D.
不好说
【单选题】The plane ________ when we got to the airport. The plane ________ when we got to the airport. A . had taken off B . was taken off C . will take off D . is taking off
A.
had taken off
B.
was taken off
C.
will take off
D.
is taking off
【单选题】有一外径为18mm的无缝钢管,管内通冷冻盐水,为减少冷量损失,在管外包一层热导率λ=0.18W/(m·℃)的石棉,保温层外壁与空气对流给热系数α=10W/(m2·℃),比较石棉厚为5mm和8mm时的冷量损失()
A.
5mm 时损失较大
B.
8mm 时损失较大
C.
一样大
D.
不好说
【单选题】有一外径为18mm的无缝钢管,管内通冷冻盐水,为减少冷量损失,在管外包一层热导率λ=0.18W/(m·℃)的石棉,保温层外壁与空气对流给热系数α=10W/(m2·℃),比较石棉厚为5mm和8mm时的冷量损失()*
A.
8mm 时热损失较大
B.
5mm 时热损失较大
C.
一样大
D.
不好说
【单选题】The train when we got to the station.
A.
has just left
B.
had just left
C.
leaves
D.
left
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