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问题 选择题

下图是产品生命周期与销售利润曲线图。如果要阻止产品生命周期从A点到B点运动，企业应该采取的措施是

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①增加产品的市场效用　 ②扩大产品的生产规模　 ③提高产品的科技含量　 ④开拓产品的市场范围

A．①③④

B．①②④

C．①②③

D．②③④

答案

答案：A

单项选择题

在金属切削机床加工中，下列属于主运动的是( )。

A．磨削时砂轮的旋转运动

B．铣削时工件的移动

C．钻削时钻头直线运动

D．牛头刨床工作台的水平移动
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单项选择题

Water is (41) important of all the things we (42) and drink. Not many people understand this, (43) it’s quite true. The human body (人体) can go (44) food for a long time, but two (45) three days without water can usually (46) people die.
Many people don’ t understand how much water the human body needs to work well and many people do not drink (47) , even (48) hot weather.
Our body is (49) water, about 65% to 75%, ff we do not have enough water, we’ll (50) tired and many will get ill. So you see, how important water is to us all.

[A] make [B] get[C] let
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