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【简答题】
简述PEC7型单元制动机闸瓦间隙调整器的制动工作原理。
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皮皮学刷刷变学霸
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【单选题】51单片机串行通信引脚有数据接收端RXD和数据发送端TXD,它们分别对应的引脚是。
A.
P3.0、P3.1
B.
P3.2、P3.3
C.
P3.4、P3.5
D.
P3.6、P3.7
【多选题】Why should a visitor to a large firm make an appointment in advance?
A.
Because executives are usually quite busy.
B.
Because executives often have to go out on business.
C.
Because executives often do not have much time for visitors.
D.
Because executives are often away from the office.
【简答题】Why should a firm be cautious about entering a licensing agreement?
【单选题】Why are the two brothers and the sister of Wilbur and Orville mentioned in paragraph 5?
A.
Because they all had more education.
B.
To illustrate that the abilities and personal qualities of Wilbur and Orville had enable them to achieve their goals without college education.
C.
To illustrate why it was not necessary for them to go to college.
D.
To contrast the achievements of different family members.
【单选题】— Li Na went out of the China Open in the first round. Why should she be defeated by such an unknown player? — Well, that's OK. She __________ enough after becoming the world champion. [ ]
A.
could not train
B.
must not have trained
C.
can not train
D.
may not have trained
【单选题】The two brothers are talented in maths, and both of them won the first prize of maths competition. [ ]
A.
similarly
B.
familiarly
C.
frequently
D.
correctly
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