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单项选择题

物体重P，与水平面之间的摩擦因数为fs。今欲使物体滑动，分别用题5图与题6图所示的两种施力方式，则省力的方式。

A．题5图示
B．题6图示
C．不能确定

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热门试题

多项选择题以下关于缆索吊装的安全要求，正确的有( )。A、主索道和塔架的拆除应在拆除方案中制订安全技术措施B、滑轮组应共同承受荷载，受力不均时，应进行调整C、钢丝绳必须选用新钢丝绳D、主索道两端应设置限位器E、缆索塔架应按设计图组拼

单项选择题3. Parallelism can be found in the following speeches EXCEPT__________.

A．My message to all of you today is this: Do not waste a minute living someone else’s dream. It takes a lot of real work to discover what brings you joy.
B．Our transportation crisis will be solved by a bigger plane or a wider road, mental illness with a pill, poverty with a law, slums with a bulldozer, urban conflict with a gas, racism with a goodwill gesture.
C．But at the end of the day, we can have the most dedicated teachers, the most supportive parents, the best schools in the world -- and none of it will make a difference, none of it will matter unless all of you fulfill your responsibilities, unless you show up to those schools, unless you pay attention to those teachers, unless you listen to your parents and grandparents and other adults and put in the hard work it takes to succeed.
D． You want to be a doctor, or a teacher, or a police officer? You want to be a nurse or an architect, a lawyer or a member of our military? You’re going to need a good education for every single one of those careers. You cannot drop out of school and just drop into a good job. You’ve got to train for it and work for it and learn for it.