TAU（跟踪区更新）的作用（）

A:在网络登记新的用户位臵信息 B:给用户分配新的GUTI C:使UE和MME的状态由EMM-DEREGISTERED变为EMM-REGISTERED D:IDLE态用户可通过TAU过程请求建立用户面资源

TAU根据UE状态不同可分为（）

A:空闲态TAU B:连接态TAU C:非联合TAU（更新TAILIST） D:联合TAU（更新TAILIST+LAU）

TAU根据更新内容不同可分为（）

A:空闲态TAU B:连接态TAU C:非联合TAU（更新TAILIST） D:联合TAU（更新TAILIST+LAU）

TAC/TAU过程描叙正确的是：（）

A:TAU只能在IDLE模式下发起，TAU分为普通TAU和周期性TAU， B:TAU过程一定要先进行随机接入，TAC内所有小区的PAGING数量是一样的， C:TAU是NAS层的过程，TAU过程不要先进行随机接入， D:TAC是MME对UE移动性管理的区域，TAU可以在IDLE或CONNECT模式下发起.

图示单元体，法线与x轴夹角α=45°的斜截面上切应力τα是（）。

A: B:τα=50MPa C:τα=60MPa D:τα=0

空心圆轴，其内外径分别为α，扭转时轴内的最大切应力为τ，这时横截面上内边缘处的切应力为（）。

B:ατ C:τ/α D:(1-α⁴)τ

空心圆轴，其内外径分别为α，扭转时轴内的最大切应力为τ，这时横截面上内边缘处的切应力为（）。

B:ατ C:τ/α D:(1-α⁴)τ

如图所示的悬臂梁，自由端受力偶M的作用，梁中性层上正应力σ及剪应力τ为（）。

A:σ=0，τ=0 B:σ=0，τ≠0 C:σ≠0，τ=0 D:σ≠0，τ≠0

Roger lived in the city of London, and his hair was always cut by the same old man. He always cut Roger’s hair as Roger liked it, and while he was doing it, the two men talked about football.
One day, when Roger was sitting in his chair, and his hair was being cut as usual, the old man said to him, "Roger, I’m going to be seventy years old next month and I feel tired, so I’m going to sell my shop to a young man. He liked to cut hair for people."
Roger was sorry to hear that, because he enjoyed talking to the old man, and he was also worried that his hair would not be cut as well by the new young man as it had been for so many years by his old friend.
He went to the shop again the next month, and the new young man was there. He cut Roger’s hair, but he did it badly.
The next month, Roger went into the shop again. The young man asked him how he would like his hair cut, and Roger answered, "Please cut it very short on the right side, but leave it as it is on the left. It must cover my ear. On top, cut all the hair away in the middle, but leave a piece at the front."
The young man was very surprised when he heard this, "But sir," he said, "I can’t cut your hair like that! "" Why not " Roger asked. "That’s how you cut it last time./

A:Roger liked his hairstyle cut by the young man last time B:the young man could cut hair in different styles C:the young man was good at cutting hair D:Roger wanted the young man to know how badly he did last time

Passage Four
Roger lived in the city of London, and his hair was always cut by the same old man. He always cut Roger’s hair as Roger liked it, and while he was doing it, the two men talked about football.
One day, when Roger was sitting in his chair, and his hair was being cut as usual, the old man said to him, "Roger, I’m going to be seventy years old next month and I feel tired, so I’m going to sell my shop to a young man. He liked to cut hair for people."
Roger was sorry to hear that, because he enjoyed talking to the old man, and he was also worried that his hair would not be cut as well by the new young man as it had been for so many years by his old friend.
He went to the shop again the next month, and the new young man was there. He cut Roger’s hair, but he did it badly.
The next month, Roger went into the shop again. The young man asked him how he would like his hair cut, and Roger answered, "Please cut it very short on the right side, but leave it as it is on the left. It must cover my ear. On top, cut all the hair away in the middle, but leave a piece at the front."
The young man was very surprised when he heard this, "But sir," he said, "I can’t cut your hair like that!" "Why not" Roger asked. "That’s how you cut it last time."

A:Roger liked his hairstyle cut by the young man last time B:the young man could cut hair in different styles C:the young man was good at cutting hair D:Roger wanted the young man to know how badly he did last time