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【单选题】
一个齿轮上的圆有（ ）A.
齿顶圆和齿根圆
B.
齿顶圆、分度圆、基圆和齿根圆
C.
齿顶圆、分度圆、基圆、节圆、齿根圆
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举一反三
【简答题】Nowadays more and more people __________(更愿意使用信用卡) than pay in cash.
【单选题】Nowadays, people ____ pay for things conveniently with their mobile phone.
A.
must
B.
need
C.
can
D.
should
【简答题】推销员旅行问题。设有5个相互可直达的城市A、B、C、D、E，如图5．13所示，各城市间的交通费用已在图中标出。推销员从城市A出发，去每个城市各旅行一次，最后到达城市E，请找出一条费用最省的旅行路线。
【判断题】More and more people would like to pay by mobile phone nowadays, like Alipay or Wechat. They are easy and convenient to use.
A.
正确
B.
错误
【简答题】Nowadays more and more people __________(更愿意使用信用卡) than pay in cash.
【简答题】Translate the following sentences into Chinese .(英译汉) With the living standard higher and higher, people have more and more foods to choose. Nowadays people pay attention not only to the variety of fo...
【多选题】Nowadays more and more people pay attention to their health and lifestyle.
A.
Y
B.
N
C.
NG
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