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【判断题】
$("div>p")选取 元素下所有的 的子元素。A.
正确
B.
错误
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【判断题】An expansion port is a small circuit board that provides a computer with the ability to control a storage device, an input device, or an output device.
A.
正确
B.
错误
【单选题】To control a device or system is to adjust or vary_____ which affect it.
A.
location
B.
lines
C.
the parameters
D.
the structures
【单选题】Complete the following sentence: An open-loop control system utilizes an actuating device to control a process .
A.
using feedback
B.
without using feedback
C.
in engineering design
D.
in analysis of a control system
【单选题】A is a device that allows a small amount of electrical current to control a large amount of current.
A.
battery
B.
neutral safety switch
C.
starter relay
D.
starter solenoid
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