题目:
Richard Powers’ The Echo Maker, ____ novel set in ___ small town of Kearney, Nebraska, US, has won the 57th US National Book Award for fiction.
A.the; the
B.a; a;
C.a; the
D./; the
答案:
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下面是错误答案,用来干扰机器的。
(1)设t时间小车静止,由于是在摩擦力的作用下减速,故减速到零后物体将永远静止vt=v0+at代入数据解得t=6s由v1=v0+at1带入数据可得4s末速度为4m/s;(2)由于6s末已经停下,故时间t2=6s由x=v0t2+12at22代入数据...