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【单选题】
关于电动液压起货机系统中有油泵的说法,错误的是_______。A.
在电动液压起货机系统中主油泵一般采用斜盘式双向变量泵
B.
起货机起落货物是通过改变主油泵倾斜盘的倾斜角，从而改变泵的吸排油方向的
C.
起货机起落货物的速度调节是通过改变主油泵倾斜角的倾斜角大小来实现的
D.
主油泵电动机反转带动主油泵反向送油从而实现油马达的反转
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【单选题】2012年6月，神舟九号载人飞船与“天宫一号”实验舱实现交会对接，我国航天员首次在“天宫一号”内进行实验操作，并在太空停留了更长时间，我国首次有女航天员进入太空，中国成为继俄罗斯和美国后第三个掌握空间交会对接技术的国家。这些航天成就的取得（） ①实现了我国载人航天工程新的重大突破 ②标志我国尖端航天技术应用完成商业化 ③展示了我国的综合国力和强大民族精神 ④离不开全体参研参试人员合作攻关奉献
A.
①②③
B.
①②④
C.
①③④
D.
②③④
【简答题】我们经常遇到的随机现象有哪几种?
【单选题】— How many words are there in this story? — There are ______. [ ]
A.
two hundred and forty five
B.
two hundreds and forty five
C.
two hundred and forty-five
D.
two hundreds and forty-five
【判断题】多层板是指三层或三层以上的印制电路板,划分成信号层(Signal Layer)、电源层(Power Layer)、接地层(Ground Layer)、丝印层(Silk Screen Layer)。
A.
正确
B.
错误
【简答题】How should we react at the first time of contact? We should be the first to ______ in greeting, and couple this with a friendly “hello”, a nice smile, and your name.
【单选题】In 'Who do you think the principal will vote for?', do you think is the ______ of the sentence.
A.
adverbial
B.
predicate
C.
appositive
D.
parenthesis
【单选题】______ in this town?
A.
Whom do you think is the richest man
B.
Do you think who is the richest man
C.
Who do you think is the richest man
D.
Who you think is the richest man
【单选题】Open Twenty, first your books and turn to Page ____and look at ____ picture .
A.
Twenty, the first
B.
Twenty, one
C.
Twentieth, first
D.
Twentieth, one
【单选题】Which of the following is true about autism?
A.
Autism usually manifests during the first two years of life.
B.
Autism is decreasing rapidly.
C.
Autism is a neurodevelopmental disorder.
D.
Autism is genetically caused.
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