Which of the following is RIGHT?A.In the...

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【单选题】

Which of the following is RIGHT?

In the early 19th century, the first trains began to carry passenger.

Dinosaurs lived on Earth more than 60 millions years before human beings.

The king ordered his men to collect a bag of rice.

There are many tiny computers around us, and we dependent on them nearly every day.

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参考答案：

举一反三

【判断题】在电网容量不够大时，鼠笼式电动机常采用降压起动。降压起动时，电动机起动性能与全压起动相同。()

正确

错误

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【判断题】大容量星型联接的电动机可采用Y-降压起动。()

正确

错误

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【判断题】Date of the intended traveling

正确

错误

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【判断题】自耦变压器降压起动是指电动机起动时，利用自耦变压器来降低加在电动机定子绕组上的起动电压。（）

正确

错误

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【单选题】What type of course is the following? A short course, given by a facilitator, usually involving workshops, intended to keep professionals up to date.

Refresher course

Conference

Distance course

Full-time graduate course

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【单选题】What type of course is the following? A short course, given by a facilitator, usually involving workshops, intended to keep professionals up to date. What type of course is the following? What type...

Refresher course

Conference

Distance course

Full-time graduate course

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【单选题】设D:全总个体域,L(x):x是演员,J(x):x是老师,A(x,y):x钦佩y,则命题“所有演员都钦佩某些老师”的逻辑符号化为( )。

x(L(x)→A(x,y))

x(L(x)→ y(J(y)∧A(x,y)))

x y(L(x)∧J(y)∧A(x,y))

x y(L(x)∧J(y)→A(x,y))

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【简答题】文件共享权限分为 ()()()三种。