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【单选题】
( )也称为点火线圈一次绕组通电时间控制。A.
点火能量
B.
闭合角
C.
点火提前角
D.
控制角
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皮皮学刷刷变学霸
举一反三
【单选题】We learn from the last paragraph that______.
A.
a baby dinosaur looks like a bird
B.
T-rex is a kind of dinosaur figure familiar to kids
C.
living feathered dinosaurs can still be found in certain parts of the world
D.
scientists understand precisely how and why feathers first arose
【单选题】Why is one of the sinkholes called "watch out for dinosaurs"?
A.
dinosaur bones were found there
B.
the area seemed like a different world
【单选题】Why is one of the sink holes called 'Watch out for dinosaurs"?
A.
a. Dinosaur bones were found there.
B.
The area seemed like a different world
【单选题】Why does the documentary mention dinosaurs?
A.
Dinosaurs are belived to be the ancestor of human.
B.
There are still living dinosaurs on earth.
C.
To find the coelacanth is like finding a dinosaur still alive.
D.
Dinosaurs caused the extinction of some fishes.
【单选题】Have you found out the exact reason why the dinosaur _________ many years ago?
A.
died down
B.
died out
C.
died from
D.
died of
【简答题】在相同的冷却条件下，一级节流循环要比二级节流循环的制冷系数小，为什么目前采用一级节流循环形式的较多？
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