- 感应电动势
- 共4433题
He must have been very depressed when he heard the news, ______
A．mustn't he
B．haven't he
C．wasn't he
D．didn't he
正确答案
C
解析
这里must是推测性用法，表示对过去某一情况进行推测，用于推测性用法时，反意疑问句不能用它作为疑问部分的助动词，而要根据该过去某一情况的实际表达方式来定，即不用must表示推测时，此过去情况应该如何表达，反意疑问句的疑问部分就用相应的助动词，例如：
He must be a teacher，isn't he
He must have heard it then，didn't he 故C。
He's ______ enough to stand all the hardships.
A．tough
B．rough
C．crude
D．hoarse
正确答案
A
解析
暂无解析
Financial aid is largely given to those who ______
A．study well.
B．need money.
C．cannot repay.
D．lose their jobs.
正确答案
B
解析
本文表明奖学金是有限的，无力支付学费的人应设法得到经济上的帮助，但必须做到借钱还钱，或找到工作，挣钱上学。
According to the passage, which of the following is NOT true
A．Foreign students if they are permanent residents in the U. S. can receive government assistance.
B．Foreign students with 1-20 visa cannot receive government assistance.
C．More students can receive scholarships than other types of financial aid.
D．Students in financial difficulty can receive assistanc
正确答案
C
解析
暂无解析
Many people moved west after independence in order to ______ .
A．buy land at a low price
B．occupy land for family farms
C．build railroads
D．set up colleges
正确答案
B
解析
暂无解析
西方中央银行常用的货币政策工具是( )。
A．公开市场业务
B．贴现率政策
C．准备率
D．选择性信用管制
正确答案
A
解析
暂无解析
相线对地标称电压为220V的TN系统配电线路的接地故障保护，其切断故障回路的时间应符合配电线路或仅供给固定式电气设备用电的末端线路，不大于( )的规定。
A．0.4s
B．4s
C．0.5s
D．5s
正确答案
D
解析
暂无解析
The generation of Americans being talked about refers to those people ______.
A．who are the first of this century to mature
B．who could meet the stiffest of challenges
C．who have matured in peace and prosperity
D．who remember the assassinations of Robert Kennedy and Martin Luther King, Jr
正确答案
C
解析
暂无解析
柴油发电机房内应设置储油间，其总储存量不应超过( )的需要量，储油间应采用防火墙与发电机间隔开；当必须在防火墙上开门时，应设置能自行关闭的甲级防火门。
A．6h
B．8h
C．12h
D．24h
正确答案
B
解析
暂无解析
为减少接地故障弓I起的电气火灾危险而装设的漏电电流动作保护器，其额定动作电流不应超过( )。
A．1A
B．0.5A
C．0.1A
D．0.03A
正确答案
B
解析
暂无解析
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