无脉冲拨号或双音频拨号一般是其信号输入电路故障。

Questions 11 to 15 are based on the following passage: ( 10 分 )In the United States, it is important to be on time, or punctual, for an appointment, a class, a meeting, etc. However, this may not be true in all countries. An American professor discovered this difference while teaching a class in a Brazilian university. The two-hour class was scheduled to begin at 10 a.m. and end at 12. On the first day, when the professor arrived on time, no one was in the classroom. Many students came after 10 a.m. Several arrived after 10:30 a.m. Two students came after 11 a.m. Although all the students greeted the professor as they arrived, few apologized for their lateness. Were these students being rude He decided to study the students’ behavior.The professor talked to American and Brazilian students about lateness in both an informal and a formal situation: at a lunch with a friend and in university calls, respectively. He gave them anexample and asked them how they would react. If they had a lunch appointment with a friend, the average American student showed clearly lateness as 19 minutes:after the agreed time. On the otherhand, the average Brazilian student would be 33 minutes late.In an American university, students are expected to arrive at the appointed hour. In contrast, inBrazil, neither the teacher nor the students always arrive at the appointed hour. Classes not onlybegin at the scheduled time in the United States, but also end at the scheduled time. In the Brazilianclass, only a few students left the class at 12:00; many remained past 12:30 to discuss the class andask more questions. Arriving late may not be very important in Brazil, neither is staying late.

Which of the following is NOT true according to the passage

A．Both American and Brazilian students will often be late for a lunch appointment.

B．Classes begin and end at the scheduled time in the United States.

C．Brazilian teachers don’t mind staying late after class.

D．Brazilian students usually arrive late and leave early.

假定08年6月12日，某支行发生了下列人民币业务，不属于大额交易的是（）。

A、甲公司划款给天一贸易公司人民币154万元，划款给**五金店人民币46万元

B、乙公司划款给李某个体工商户100万元

C、丁某持本人活期存折柜面人民币现金取款2笔，账号1取款12万元，账号2取款10万元

D、丙公司收到他行某房产公司划款人民币200万元

简析《静静的顿河》的主要思想内容。

下列各项中，属于会计核算主要环节的有( )。

A．记账、算账和报账

B．确认、计量、记录、计算、报告

C．收入、费用和利润

D．资产、负债和所有者权益

某办公楼工程，建筑面积2.5万m²，工程基础采用桩基础，主体为框架-剪力墙结构，由某建筑公司负责施工。在工程施工过程中，发生了如下事件：
事件一：桩基础采用干作业成孔灌注桩，成孔后孔底虚铺土厚度120mm。
事件二：在二层框架-剪力墙结构施工过程中，发现部分梁表面出现蜂窝和孔洞。
事件三：在主体结构施工过程中，三层混凝土部分试块强度达不到设计要求，但对实际强度经测试论证，仍达不到要求，后经设计单位验算能够满足结构安全性能。

混凝土配合比应采用( )。

A．体积比

B．性能比

C．质量比

D．容量比