形成周围有髓神经纤维的髓鞘的是（） A．小胶质细胞 B．少突胶质细胞 C．星形胶质细

20×9年1月1日，甲公司从二级市场购入乙公司分期付息、到期还本的债券12万张，以银行存款支付价款1050万元，另支付相关交易费用12万元。该债券系乙公司于20×8年1月1日发行，每张债券面值为100元，期限为3年，票面年利率为5%，每年年末支付当年度利息。甲公司拟持有该债券至到期。

要求：

根据上述资料，不考虑其他因素，回答下列各题。

甲公司持有乙公司债券至到期累计应确认的投资收益是()

A、120万元

B、258万元

C、270万元

D、318万元

阅读理解。

     It's a Sunday morning. Lin Tao has no classes today. Ha has breakfast and goes out. He is going to

his grandfather's home. Now he is on his way there. He walks and walks. Then he came to a river. The

river is not wide. There is a board over the river. Lin Tao walks onto the board. Suddenly he falls into

the river. "Help! Help!" Lin Tao is crying. But no one comes. There is no one near the river. He waits in

the water for some time. But nothing happens. He begins to get up. Aha, the water is not very deep. It

only comes to half his legs.

1. Lin Tao goes to his grandfather's home on a ____.   

A. Sunday afternoon      

B. Saturday afternoon.   

C. Sunday morning.

2. The river is ____.

A. very wide but not deep    

B. very deep but not wide    

C. not wide or deep

3. Lin Tao falls into the river when he ____.

A. is walking on the board    

B. comes to the river    

C. walks along the road

4. ____ comes to help him.    

A. A man near the river      

B. No one   

C. His grandfather

5. Lin Tao ____ the river at last.      

A. walks out of    

B. waits in    

C. walks along

（18分）如图，置于圆形水平转台边缘的小物块随转台加速转动，当转速达到某一数值时，物块恰好滑离转台开始做平抛运动。现测得转台半径R="0.5" m,离水平地面的高度H=0.8m,物块平抛落地过程水平位移的大小s=0.4m。设物块所受的最大静摩擦力等于滑动摩擦力，取重力加速度g=10m/s²。求：

（1）物块做平抛运动的初速度大小v₀；

（2）物块与转台间的动摩擦因数μ。

（）对其在货物运单和物品清单内所填记事项的真实性应负完全责任。

A、承运人

B、收货人

C、托运人

D、货运员

客户换了手机号码，但手机没有换，客户还可以继续使用手机银行。