袋式除尘器的过滤作用通常是由几种效应产生？

阅读下面短文，根据短文内容判断句子的正误。正确的涂 “A”，错误的涂 “B”。（共5小题，每小题2分；计10分）

When I was a boy, I didn't have any hair on my head. So I was very shy. I liked to watch my friends play in the park. Sometimes I would join them, but most of the time I just watched them play.

Every day, we would see an old man walking in the park. He had big ears and no hair. We thought he was dumb (哑的). Every time when my friends saw him, they would say loudly, "Hey, Mr. Dumb, what's the time?” But they got no answer.

One early evening, I was standing outside my house, and I saw the old man coming. I was not with any of my friends and there were no other kids around to say the usual words of "greeting( 问候)”.

But how could I let the old man walk by without saying anything? So for the first time, I asked, “Hey, Mr. Dumb, what’s the time?"

The old man looked at me. Then he looked at his watch and answered, "It's six thirty. " I ran into my house and never said that "greeting" to the old man after that day.

小题1:The boy often played with his friends together.

小题2:The boy’s friends were very polite to the old man.

小题3:Neither the boy nor the old man had any hair on the head.

小题4:Actually, the old man could hear and speak.

小题5:At last ,the boy felt ashamed of what he did with the old man.

急性血吸虫病血象检查显著增多的是（）

A.中性粒细胞

B.白细胞总数

C.嗜酸性粒细胞

D.嗜碱性粒细胞

E.单核细胞

终端接收站点使用的是（）频段的卫星接收天线。

A.Ku

B.VH

C.C

D.Ka

[说明]

Z省省会城市火车售票系统负责XX火车站各班次火车的票务销售，并在该省会城市设有多个该火车票销售网点，各售票网点使用相同的售票程序。假设售票程序中用到的伪指令如表6-14所示。

假设某售票网点一次售出n张火车班次A的火车票，则售票程序的伪指令序列为：R(A,x);W(A,x-n)。根据上述业务及规则，完成下列问题。
1. 若两个售票网点同时销售火车班次A的火车票，在数据库服务器端可能出现如下的调度。
A：R₁(A,x), R₂(A,x), W₂A,x-5), W₁(A,x-3);
B：R₁(A,x), W₁(A,x-3), R₂(A,x), W₂A,x-5);
C：R₁(A,x), R₂(A,x), W₁(A,x-3), W₂A,x-5)；
其中R_i(A,x)，W_i(A,x)分别表示第i个销售网点的读写操作，其余类同。
假设当前火车班次A剩余20张火车票，分析上述3个调度各自执行完后的剩余票数，并指出其中错误的调度，简要分析产生错误的主要原因。

仪表指针开始动作的信号（），仪表的灵敏度就越高。

A.越小

B.不变

C.越大

D.略大