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【简答题】
“PF-Ⅰ-40-Φ60×30×1000-GB/T20974”表示的含义是什么?
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反馈参考答案：
举一反三
【单选题】如图所示,两飞轮A、B组成一摩擦啮合器。A通过与B之间的摩擦力矩带着B转动。则此刚体系在啮合前后:
A.
角动量改变，动能也改变
B.
角动量改变，动能不变
C.
角动量不变，动能改变
D.
角动量不变，动能也不变
【单选题】If only I could make the trip with you ! But I stay home and take care of my sick mother.
A.
could
B.
was going to
C.
may
D.
have to
【单选题】如图所示,两飞轮A、B组成一摩擦啮合器。A通过与B之间的摩擦力矩带着B转动。则此刚体系在啮合前后
A.
角动量改变，动能也变化
B.
角动量改变，动能不变
C.
角动量不变，动能改变
D.
角动量不变，动能也不变
【单选题】如图所示，两飞轮A、B组成一摩擦啮合器。A通过与B之间的摩擦力矩带着B 转动。则此刚体系在啮合前后【图片】
A.
角动量改变，动能也改变
B.
角动量改变，动能不变
C.
角动量不变，动能改变
D.
角动量不变，动能也不变
【单选题】听力原文：M: What kind of father am I? My only son almost died and I didn't even know he was ill. W: Don't blame yourself. You were too busy to pay attention to him. If his mother was still alive, things w...
A.
His only son is dying.
B.
He didn't like after his sick wife.
C.
His mother died some time ago.
D.
He hasn't taken good care of his son.
【单选题】如图所示，两飞轮A、B组成一摩擦啮合器。A通过与B之间的摩擦力矩带着B转动。则此刚体系在啮合前后：【图片】
A.
角动量改变，动能也变化
B.
角动量不变，动能变化
C.
角动量不变，动能也不变
D.
角动量改变，动能不变
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