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【简答题】
任务型阅读,根据表格内容,完成所给任务(每空一词) There is a very popular organization with young people in our community. I joined it two years ago. And I have taken part in many interesting activities. What we have done can not only help others but also make ourselves happy. Last Sunday, we went to an old people’s home. After helping them do some housework, we sang, danced and played games with them. The old people were excited at our visit. They told us interesting stories about themselves. We all had a good time. After this visit, my friend and I decided to do more things to help them. Now more than 30 volunteers have joined our club. Everyone thinks the experience is wonderful. How The organization is very 小题1: with young people in their community. When The writer joined it 小题2: years ago. What They sang, 小题3: and played games with the old people there. How The old people were 小题4: at their visit. How many More than 小题5: volunteers have joined their club.
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【单选题】碰撞打靶实验中,如果不放被撞球,撞击球在摆动回来时能否达到什么样的高度()
A.
比原来高
B.
比原来低
C.
原来的高度
D.
趋近与零
【简答题】如图7-28所示,由复合泵驱动液压系统,活塞快速前进时负荷F=0,慢速前进时负荷F=20000N,活塞有效面积A=40×10 -4 m 2 ,左边溢流阀及右边卸荷阀调定压力分别是7MPa与3MPa。大排量泵流量q 大 =20 L/min ,小排量泵流量为q 小 =5 L/min ,摩擦阻力、管路损失、惯性力忽略不计,求: 1 )活塞快速前进时,复合泵的出口压力是多少?进入液压缸的流量是多少?活塞的...
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A.
减少管子长度
B.
适当增大管径
C.
降低流速
D.
减少管径
【单选题】水以 60m 3 /h 的流量在一倾斜管中流过,此管内径由 100mm 突然扩大到 200mm ,见附图。 A 、 B 两点的垂直距离为 0.2m 。在此两点间连接一个 U 形压差计,指示液为四氯化碳,其密度为 1630Kg/m 3。若忽略阻力损失,试求:( 1 ) U 形管两侧的指示液液面哪一侧高,相差多少 mm? ( 2 )若将上述扩大管路改为水平放置,压差计读数有何变化?
A.
300mm;R不变
B.
300mm;R变大
C.
340mm;R不变
D.
340mm;R变小
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【判断题】彩板窗的项目特征包括框、扇材质
A.
正确
B.
错误
【多选题】在液压管路中能量损失表现为液体的压力损失,这样的压力损失有哪两种(),
A.
全局压力损失
B.
局部压力损失
C.
沿程压力损失
D.
全程压力损失
【多选题】下列增值税纳税人中,适用以 1个季度为纳税期限规定的是( )。
A.
电信公司
B.
银行
C.
财务公司
D.
信托投资公司
【简答题】简述赠送礼节的要求
【单选题】在Word 2010中,为给每位客户发送一份相同的新产品目录,可以用______命令最简便的实现。
A.
邮件合并
B.
使用宏
C.
复制
D.
信封和标签
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