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【单选题】
设采样周期为T,则零阶保持器的传递函数为。( )A.
(1-e -Ts )/s
B.
(1-e Ts )/s
C.
(1+e -Ts )/s
D.
(1+e Ts )/s
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举一反三
【单选题】Questions 5 to 7 will be based on the following news item
A.
When to avoid a repeat of the financial cr.
B.
When to withdraw that support without harming a recovery.
C.
How to withdraw that support without harming a recovery.
D.
How to avoid a repeat of the financial cr.
【多选题】电线、电缆穿管和线槽敷线检验批质量验收记录表主控项目包括哪些内容（）。
A.
三相或单相的交流单芯电缆，不得单独穿于钢导管内
B.
不同回路、不同电压等级和交流与直流的电线，不应穿于同一导管内；同一交流回路的电线应穿于同一金属导管内，且馆内电线不得有接头
C.
电线、电缆管穿管前应清除管内杂物和积水
D.
当采用多相供电时，同一建筑物的电线绝缘层颜色选择可不一致
E.
爆炸危险环境照明线路的电线和电缆额定电压不得低于750V，且电线必须穿于钢导管内
【多选题】《建筑工程施工质量验收统一标准》GB50300-2013的有关规定，施工现场质量管理检查记录，应当包括()项目。
A.
项目质量管理体系
B.
现场质量责任制
C.
主要专业工种操作岗位证书
D.
施工组织设计、施工方案及审批
E.
施工人员名单
【单选题】Questions 5 to 7 are based on the news report you have just heard.
A.
Spend more time together.
B.
Tell them adventure stories.
C.
Do something fun and creative.
D.
Play with them in a safe place.
【单选题】The writer mentions all of the items listed below except ______.
A.
twins can help each other
B.
twins share each other's emotion
C.
twins are able to understand each other in a private language
D.
twins communicate less with their parents
【单选题】Questions 5 to 7 are based on the news report you have just heard.
A.
Hire an Australian lawyer.
B.
Visit the U.S. and Canada.
C.
Settle a legal dispute.
D.
Expand their business.
【单选题】It is almost five years we saw each other last time.
A.
before
B.
since
C.
after
D.
when
【单选题】Questions 5 to 7 are based on the conversation you have just heard.
A.
From its genes
B.
From its length
C.
From its origin
D.
From its colour
【单选题】Questions 5 to 7 are based on the news report you have just heard.
A.
A raccoon can perform acts no human can.
B.
A raccoon can climb much higher than a cat.
C.
The raccoon did something no politician could.
D.
The raccoon became as famous as some politicians.
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