本课配套习题挑战模式1/5
A: 杠杆会在水平位置静止 |
B: 杠杆右端下沉 |
C: 杠杆左端下沉 |
D: 无法确定 |
- 提示1:5p2g5p2G5bmz6KGh5p2h5Lu277ya5Yqo5Yqbw5fliqjlipvoh4I96Zi75Yqbw5fpmLvlipvoh4I=
- 答案:Qg==
6K6+5q+P5Liq6ZKp56CB55qE6YeN5Yqb5Li6R++8jOavj+S4gOagvOeahOmVv+W6puS4ukzvvIzkuKTkuLLpkqnnoIHpg73lkJHmlK/ngrnnp7vliqjkuIDmoLzvvIzmlK/ngrnlt6bovrk9M0fDl0w9M0dM77yM5Y+z6L65PTJHw5cyTD00R0zvvJ4zR0zvvIzlj7PovrnlipvkuI7lipvoh4LnmoTkuZjnp6/lpKfkuo7lt6bovrnlipvkuI7lipvoh4LnmoTkuZjnp6/vvIzmnaDmnYblj7Pnq6/kuIvmsonvvJvmlYXpgIlC77yO
本课配套习题挑战模式2/5
A: 1个 |
B: 2个 |
C: 3个 |
D: 6个 |
- 提示1:5p2g5p2G5bmz6KGh5p2h5Lu277ya5Yqo5Yqbw5fliqjlipvoh4I96Zi75Yqbw5fpmLvlipvoh4I=
- 答案:Qw==
5bem6L655Lik5Liq6ZKp56CB77yM5oiR5Lus5Y+v5Lul6K6k5Li65Yqo5Yqb5pivMk7vvIzliqjlipvoh4LkuLozY23vvIzlj7PovrnpmLvlipvoh4LkuLoyY23vvIzmoLnmja7lhazlvI9GPHN1Yj4xPC9zdWI+TDxzdWI+MTwvc3ViPj1GPHN1Yj4yPC9zdWI+TDxzdWI+Mjwvc3ViPuWPr+W+l++8mjxpbWcgd2lkdGg9MTgxIGhlaWdodD00NiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0UyLzNGL3JCQUNGRlVUdEJlaS1TRVlBQUFFOEJEUHNvUTQ4NC5wbmciPu+8jOaJgOS7peW6lOivpeaMgjPkuKrvvI7mlYXpgIlD77yO
本课配套习题挑战模式3/5
A: 他们的体重一定相等 |
B: 他们的坐处到转轴的距离一定相等 |
C: 他们对板的压力与板的受力面积的比值一定相等 |
D: 他们对板的压力及其对支点的力臂的乘积一定相等 |
- 提示1:5p2g5p2G5bmz6KGh5p2h5Lu277ya5Yqo5Yqbw5fliqjlipvoh4I96Zi75Yqbw5fpmLvlipvoh4I=
- 答案:RA==
6KaB5L2/6Le36Le35p2/5bmz6KGh77yM5b+F6aG75ruh6Laz5p2g5p2G55qE5bmz6KGh5p2h5Lu25Y2z5Yqo5Yqbw5fliqjlipvoh4I96Zi75Yqbw5fpmLvlipvoh4LvvJvogIzliqjlipvlkozpmLvlipvliIbliKvmmK/kuKTkuKrlsI/lranlr7nmnaDmnYbnmoTljovlipvvvIznlLHmnaDmnYblubPooaHnmoTmnaHku7blj6/lvpfvvIzku5bku6zopoHkvb/ot7fot7fmnb/lpITkuo7msLTlubPkvY3nva7vvIzliJnku5bku6zlr7nmnaDmnYbnmoTljovlipvlj4rlhbblr7nlupTlipvoh4LnmoTkuZjnp6/kuIDlrpropoHnm7jnrYnvvI7mlYXpgIkgRO+8jg==
本课配套习题挑战模式4/5
用扳手拧生锈的螺母时,工人师傅常在扳手柄上再套一节管子,这样就比较容易地拧下螺母.这是因为( )
A: 套上的管子较重,可以省些力 |
B: 套上的管子较粗,使用比较方便 |
C: 套上管子后可以用较大的力 |
D: 套上管子后增大了力臂 |
- 提示1:PHA+5L2/55So5p2g5p2G5pe277yM55yB5Yqb5b+F54S26LS56Led56a7PC9wPg==
- 答案:RA==
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
本课配套习题挑战模式5/5
A: 仍然平衡 |
B: 左边下沉 |
C: 右边下沉 |
D: 无法判断 |
- 提示1:5p2g5p2G5bmz6KGh5p2h5Lu277ya5Yqo5Yqbw5fliqjlipvoh4I96Zi75Yqbw5fpmLvlipvoh4I=
- 答案:Qg==
55Sx5p2g5p2G55qE5bmz6KGh5p2h5Lu25Y+v5b6X77yMRjxzdWI+MTwvc3ViPu+8mkY8c3ViPjI8L3N1Yj49MjAwTu+8mjMwME49Mu+8mjPvvIzmiYDku6XvvIzlipvoh4LkuYvmr5RMPHN1Yj4xPC9zdWI+77yaTDxzdWI+Mjwvc3ViPj0z77yaMu+8jOW3pui+ueeahOWKm+iHgumVv++8juW9k+S4pOi+ueWQjOaXtuaMgjUwTueahOegneeggeaXtu+8jEY8c3ViPjE8L3N1Yj5MPHN1Yj4xPC9zdWI+77yeRjxzdWI+Mjwvc3ViPkw8c3ViPjI8L3N1Yj7vvIzlm6DmraTlt6bovrnkvJrkuIvmsonvvI7mlYXpgIlC77yO