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【多选题】
造成汽车制动效能不良故障现象的原因有:
A.
制动间隙过大
B.
缺少制动液
C.
摩擦片磨损
D.
制动踏板自由行程过小
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A.
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B.
原子核外电子的数目越多,电子的运动状态就越多
C.
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D.
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A.
He listens very carefully to me and copies what I say.
B.
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C.
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D.
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E.
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F.
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A.
氢气做火箭的燃料
B.
浓硫酸做干燥剂
C.
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D.
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A.
灭火
B.
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C.
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D.
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A.
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B.
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C.
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D.
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A.
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B.
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C.
制造汽水
D.
干冰用于人工降雨
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