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【判断题】
共享经济实质上是闲置或者过剩资源的所用权转让。从宏观角度看,共享经济可以提升全社会范围的资源使用效率;从微观角度看,则可以降低顾客的交易、购买和使用成本,并且资源拥有者可以由此获得收益。所以,分享经济对宏观和微观层面都有诸多好处。
A.
正确
B.
错误
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【单选题】At time t = 0.00 s, a car is traveling along a straight line at a speed of 20 m/s with constant acceleration. The car travels 56.0 m during the time interval between t = 2.00 s and t = 4.00 s. What...
A.
14.0 m/ s 2
B.
7.00 m/ s 2
C.
5.33 m/ s 2
D.
2.67 m/ s 2
【单选题】侧垂面在水平投影面的投影特性为:( )。
A.
收缩性
B.
积聚性
C.
显示性
D.
垂直性
【简答题】Traveling can be expensive, (1) _____________. At some points everyone needs to take a break from (2) _________________. Whether you stay at home, take a car trip to Grandma’ s house, or (3) _________...
【单选题】侧垂面在水平投影面的投影特性为:( )。
A.
类似性
B.
积聚性
C.
显实性
D.
垂直性
【单选题】侧平面在水平投影面的投影特性为( )。
A.
收缩性
B.
积聚性
C.
显实性
D.
垂直性
【单选题】1 On average, Americans spend just over 32 hours a week listening to music in 2017, up 5.5 hours over last year. How is this possible? Technology. At home, at work and traveling in between, people are...
A.
32.1 hours
B.
26 .6 hours
C.
23.5 hours
D.
38.5 hours
【单选题】设随机变量 ζ 的数学期望和方差均是 6 ,那么P{0 ( ) 。
A.
1/6
B.
5/6
C.
1/3
D.
1/2
【单选题】侧平面在水平投影面的投影特性为:( )。
A.
收缩性
B.
积聚性
C.
显示性
D.
垂直性
【单选题】A car is traveling at an unknown velocity. It accelerates constantly over 5.0 s at a rate of 3.0 m/s2 to reach a velocity of 30 m/s. What was the original velocity of the car?
A.
1.0 m/s
B.
5.0 m/s
C.
10 m/s
D.
15 m/s
E.
20 m/s
【单选题】A speeder traveling at a constant speed of 100 km/hr passes a waiting police car that immediately startsfrom rest and accelerates at a constant 2.5 m/s^2 How long will it take for the police car to ca...
A.
22.2 s
B.
23.3 s
C.
24.8 s
D.
21.4 s
E.
25
F.
20
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