男性，40岁。因胸闷、气急来诊。心超检查示肥厚型心肌病。心室壁明显增厚，心室腔正常（

Playing is serious business for children. In fact, it’s what they do best! Ask them why they do it, and kids will probably say, “Because it’s fun!” But it’s much more than that. It’s also good for them.

Studies show that from birth babies begin learning through playing. They use their five senses to get to know their new world. Touching allows them to discover how different things feel. Brightly colored toys and clothing help develop a baby’s sense of sight.

When small children choose which toy to play with, they begin developing their abilities in making decisions. Children love toys that allow them to use their imagination. Sometimes an empty box is more fun than a high-tech toy. That’s because a box can become anything a child imagines it to be.

Crayons, paints and Ply-Doh(彩色塑泥)are also good because they allow children to create. Traditional building blocks teach important pre-math skills like problem-solving.

Playing doesn’t become any less important once children start school. __＊___. Kids learn how to share, take turns and play by the rules.

小题1:Why is playing a serious business for children?

A．Because it is fun.

B．Because children can get much more from playing.

C．Because children make friends through playing.

D．Because children like playing.小题2:What does touching help babies develop?

A．Touching helps babies to discover how different things feel.

B．Touching help develop babies’ sense of sight.

C．Touching helps develop babies’ imagination.

D．Touching helps develop babies’ pre-math skills.小题3:What can we fill in the＊ ?

A．Classroom is the most important place for children to learn life

B．Many useful lessons about life are learned on the school playground

C．No useful lessons about life are learned on the school playground

D．Children can’t play on the school playground any more小题4:What’s the best title for the passage?

A．Playing With Children

B．How to Become a Playboy

C．How to Play

D．Playing Plays an Important Role in Life

下列装饰装修施工事项中，所增加的荷载属于集中荷载的有（）。

A、在楼面加铺大理石面层

B、封闭阳台

C、室内加装花岗岩罗马柱

D、悬挂大型吊灯

E、局部设置假山盆景

如图所示，匝数为100匝、面积为0.01m²的线圈，处于磁感应强度B₁为

1

π

T的匀强磁场中．当线圈绕O₁O₂以转速n为300r/min匀速转动时，电压表、电流表的读数分别为7V、l A．电动机的内阻r为1Ω，牵引一根原来静止的、长L为1m、质量m为0.2kg的导体棒MN沿轨道上升．导体棒的电阻R为1Ω，架在倾角为30°的框架上，它们处于方向与框架平面垂直、磁感应强度B₂为1T的匀强磁场中．当导体棒沿轨道上滑1.6m时获得稳定的速度，这一过程中导体棒上产生的热量为4J．不计框架电阻及一切摩擦，g取10m/s²．求：

（1）若从线圈处于中性面开始计时，写出电动势的瞬时表达式；

（2）导体棒MN的稳定速度；

（3）导体棒MN从静止至达到稳定速度所用的时间．

小额贷款贷前调查过程中，可在一定程度上反映客户经营能力和诚信度的内容主要有（）。

A.客户主要的债权债务

B.设备是否充分利用、维护得当

C.客户是否熟悉自己的业务

D.对待顾客、雇员、供货商、家人的态度

日常生活中那些因素易造成感染和传播？