余--- 则----
①他们夺下了父亲的手枪。
②法官狠狠地拍了几下那块木板。
图甲为小刚和小强对“滑动摩擦力的大小与哪些因素有关”这一问题提出猜想时的情景.为了验证他们的猜想,他们找来了量程合适的弹簧测力计一个、长木板一块、质量相同的长方体木块和塑料块各一块.

他们通过用乙、丙所示的实验,可得出的结论是:在保持 一定时, 越大,滑动摩擦力就越大.

小刚和小强都感到实验中弹簧测力计读数有一定的困难.经过思考,小刚提山如果按照图丁所示来改进实验装置,实验效果会显著改善.请写出这样改进的好处: .


。若用水平恒力F向右拉动木板A(已知最大静摩擦力的大小等于滑动摩擦力),要使A从C、B之间抽出来,则F大小应满足的条件是( )
B .
C .
D .
中,
.设
为数列
的前n项乘积,则满足
的正整数n的最小值是.
中,
,
,若点
,
,
分别是边
,
,
的中点,则
( )
B .
C .
D .
— ______________
N拉着小球并带动木块一起向右匀速运动,运动中M、m的相对位置保持不变,g=10m/s2 . 在运动过程中,求:
Lin Hong is my new friend. Her father has a shop near the factory. The /θIŋz/ in his shop are all nice. And his family are kind the workers. So they like to buy /'sʌmθIŋ/ there. It's Saturday today. Lin Hong doesn't go to school. She knows her father is busy, so she gets up early. She does her homework and then goes to the shop to help her father. There (be) many people in it. She sells(卖) bananas, apples, (orange) and drinks to the workers. A car stops(停) in front of the shop. The (drive) comes in and buys some hamburgers and then goes away. Lin Hong finds his bag on the /flɔː(r)/. She runs out, she can't see his car. "I know Mr. Yang. We can take bag to him this evening," says Mr. Lin. It's nine and the shop is closed(关闭的). Lin Hong and her father go to Mr. Yang's home. The man and his family thank (they) very much.
材料:舟山市陈某在玩网络游戏时得知,一个自称为李某的人可以帮忙代刷游戏里使用的虚拟财富。陈某联系了李某,并按对方的要求进行了多次充值,金额共计1万多元,但都未成功充值,事后李某也联系不上了,这时陈某意识到可能被骗了,选择向公安机关报警。
—I'm afraid it is _______ for print advertising.