试题 试卷
题型:单选题 题类:易错题 难易度:普通
(1)4.5m= {#blank#}1{#/blank#} cm= {#blank#}2{#/blank#} mm= {#blank#}3{#/blank#} km;
(2)3h= {#blank#}4{#/blank#} min= {#blank#}5{#/blank#} s;
(3)20m/s= {#blank#}6{#/blank#} km/h;
(4)54km/h= {#blank#}7{#/blank#} m/s.
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