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问题 选择题

功率相等的两辆汽车,在相等时间内匀速通过的距离之比为3∶2,则下列说法中正确的是(   )

A．两辆汽车所做的功之比为3∶2

B．两辆汽车所做的功之比为1∶2

C．两辆汽车的牵引力之比为3∶2

D．两辆汽车的牵引力之比为2∶3

答案

答案：D

由距离之比为3:2可知速度之比为3:2，由P=Fv可知牵引力之比为2:3，牵引力做功为W=Fs，做功之比为1:1，D对；

多项选择题

下列选项中，属于征收土地方案内容的有( )。

A．土地补偿标准

B．被征地人员安置途径

C．征地补偿的法律依据

D．被征土地所有人的接收情况和有关反映

E．被征土地的数量、位置、权属
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单项选择题

The software architecture of a program or computing system is the structure or structures of the system, which comprise software______, the externally ______ properties of those components, and the relationships between them. The architecture is not the operational software. Rather, it is a ______ that enables a so, ware engineer to: analyze the ______ of the design in meeting its stated requirements, consider architectural alternatives at a stage when making design changes is still relatively easy, and reduce the ______ associated with the construction of the software.

A．visible
B．reliable
C．secure
D．robust
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