试题与答案

如图所示,放在水平地面上的物体M上放着物体m,现两者之间有一处于压缩状态的弹簧,

题型:选择题

题目:

如图所示,放在水平地面上的物体M上放着物体m,现两者之间有一处于压缩状态的弹簧,整个装置一起向左运动.则M、m的受力情况是(  )

A.m受到向右的摩擦力

B.M可能受到m对它向左的摩擦力

C.地面对M的摩擦力向右

D.地面对M的摩擦力向左

答案:

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Jenny Gonzalez is excited to go to school these days. The 13-year-old from South Gate Middle School in Los Angeles, US, is taking care of three green abalones(鲍鱼)at school.

The students of Violeta Llamas’ science class, including Jenny, have cared  for the sea animals since January. The class formed eight t 小题1: .Each team takes turns to care for the abalones.Team five—Jenny, Alexis Diaz, Jennifer Gonzalez and Ricardo Beltran—have now got their t 小题2:

The abalones are k 小题3: in a box of seawater. Every day Alexis, 12, checks if the water has too much salt.Too much salt is b 小题4:  for the health of abalones.Jenny makes fresh saltwater.

Then the four students work together to clean u小题5: the waste in the box and feed the abalones.

“Sea life is l小题6: a baby. You have to clean them and care for them. ”Jennifer said.

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