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【多选题】
下面有关有效数字的说法正确的是
A.
1.458 cm的有效位数为4位
B.
有效数字的运算规则为先修约,后计算
C.
乘除运算小数点后位数最少的为准
D.
加减运算有效位数最少的为准
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A.
似动知觉
B.
动景知觉
C.
真动知觉
D.
自主知觉
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A.
The bombers bought return tickets from Luton to London.
B.
The bombers were masterminded by al Qaeda Islamist militants.
C.
The explosives were not fastened to the bombers.
D.
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A.
真动知觉
B.
自主运动
C.
诱导运动
D.
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A.
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B.
重发球
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.
运动知觉
B.
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C.
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D.
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B.
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C.
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【单选题】合法发球时,发球擦网出界应该判( )
A.
重发球
B.
对方的一分
C.
交换发球
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