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【单选题】
物体通过两个连续相等位移的平均速度分别为 , ,若物体作直线运动,则在整个过程中物体的平均速度为( )A.
12 m/s.
B.
11.75 m/s.
C.
12.5 m/s.
D.
13.75 m/s. 7、质点沿 轴作直线运动,其 图象为一曲线,如图,以下说法正确的是(B) (A) 0~t 3 时间内质点的位移用v- t曲线与t轴所围面积绝对值之和表示, 路程用v- t曲线与t轴所围面积的代数和表示; (B) 0~t 3 时间内质点的路程用v- t曲线与t轴所围面积绝对值之和表示, 位移用v- t曲线与t轴所围面积的代数和表示; (C)0~t 3 时间内质点的加速度大于零; (D)t 1 时刻质点的加速度不等于零.
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举一反三
【单选题】Opinions still ( ) among economists as to whether the economy will soon recover.
A.
differnece
B.
differ
C.
differently
D.
different
【单选题】At the world's summit, opinions were still ____ as how to effectively stop the global warming. There were clear ____ of different interests among some of the major carbon emitters.
A.
divided, manifestations
B.
dividing, shows
C.
separated, exhibitions
D.
separating, displays
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A.
循环发生嵌套时,最多只能两层
B.
三种循环for,while,do-while可以互相嵌套
C.
循环嵌套时,如果不进行缩进形式书写代码,则会有编译错误
D.
for语句的圆括号中的表达式不能都省略掉
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【单选题】张某,男,43岁,患十二指肠溃疡十余年,因反复上腹饱胀不适一个月,大量呕吐,呕吐宿食一天就诊,该病人可能出现的并发症是( )
A.
出血
B.
消化道穿孔
C.
幽门梗阻
D.
贲门梗阻
E.
胃癌
【单选题】张某，男，43岁。患“十二指肠溃疡”10余年，因“反复上腹饱胀不适1个月，大量呕吐，呕吐宿食一天”就诊，该病人可能出现的并发症是（）
A.
出血
B.
消化道穿孔
C.
幽门梗阻
D.
贲门梗阻
E.
胃癌
【单选题】张某,男,43岁,患十二指肠溃疡10余年,因反复上腹饱胀不适1个月,大量呕吐,呕吐宿食1天就诊,该病人可能出现的并发症是
A.
出血
B.
消化道穿孔
C.
幽门梗阻
D.
贲门梗阻
E.
胃癌
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