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【单选题】
《中华人民共和国标准化法》规定强制性标准必须执行，不符合强制性标准的产品，禁止( )。A.
出口
B.
使用
C.
生产、销售和进口
D.
进入市场
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【单选题】如图所示,两个啮合齿轮,小齿轮半径为10cm,大齿轮半径为20cm,大齿轮中C点离圆心O 2 的距离为10cm,A、B分别为两个齿轮边缘上的点,则A、B、C三点的( ) 提示:同缘传动时,边缘点的线速度相等;同轴传动时,角速度相等;然后结合v=ωr列式求解
A.
线速度之比为2：1：1
B.
角速度之比为2：2：1
C.
向心加速度之比为4：2：1
D.
转动周期之比为2：1：1
【单选题】Why does cream go bad faster than butter? Some researchers think they find the answer, and it comes down to the structure of the food, not its chemical composition—a finding that could help rid some p...
A.
it suggested a way to keep some foods fresh without preservatives
B.
it discovered tiny globules in both cream and butter
C.
it revealed the secret of how bacteria multiply in cream and butter
D.
it found that cream and butter share the same chemical composition
【简答题】函数y= 2 x-1 中自变量x的取值范围是______；函数y= 2x-4 中自变量x的取值范围是______．
【单选题】Why does cream go bad faster than butter? Some researchers think they have the answer, and it comes down to the structure of the food, not its chemical composition--a finding that could help rid some ...
A.
it suggested a way to keep some foods fresh without preservatives
B.
it discovered tiny globules in both cream and butter
C.
it revealed the secret of how bacteria multiply in cream and butter
D.
it found that cream and butter share the same chemical composition
【单选题】Why does cream go bad faster than butter? Some researchers think they have the answer, and it comes down to the structure of the food, not its chemical composition---a finding that could help rid some...
A.
it suggested a way to keep some foods fresh without preservatives
B.
it discovered tiny globules in both cream and butut
C.
it revealed the secret of how bacteria multiply in cream and butter
D.
it found that cream and butter share the same chemical composition
【单选题】设窗体中有标签Label1和按钮Command1,()语句可实现单击Command1后Label1中文字颜色变红色。
A.
Label1.ForeColor=RGB(255,0,0)
B.
Command1.ForeColor=RGB(255,0,0)
C.
Label1.BackColor=RGB(255,0,0)
D.
Command1.BackColor=RGB(255,0,0)
【简答题】函数 y= 3 x-4 中自变量x的取值范围是______，函数 y= 3x-9 中自变量x的取值范围是______．
【单选题】Why does cream go bad faster than butter? Some researchers think they found the answer, and it comes down to the structure of the food,not its chemical composition--a finding that could help rid some ...
A.
it suggested a way to keep some foods fresh without preservatives
B.
it discovered tiny globules in both cream and butter
C.
it revealed the secret of how bacteria multiply in cream and butter
D.
it found that cream and butter share the same chemical composition
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