题目内容
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Two shafts with the circular cross section under torsion are given in figure Q1.11. The material and the length of the two shafts are the same. The shear strain on the surface of the shaft is the same with
，then
().
A、1/8
B、1/2
C、1/4
D、1/16
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更多“two shafts with the circular c…”相关的问题
A、2:1
B、4:1
C、8:1
D、16:1
A、felt ashamed for the work relied on foreigners
B、used Rackarock for the first time in the excavation of caves
C、decided to dig two shafts above Badaling Tunnel and then excavated to both ends to form six excavation faces to accelerate the progress of the project
D、reduced the cost of the project greatly and completed the construction as scheduled
Shafts are needed () the power of the engines to the propeller.
A.to supply
B.to transmit
C.to provide
Computer Mouse
The basic computer mouse is an amazingly clever invention with a relatively simple design that allows us to point at things on the computer and it is very productive. Think of all the things you can do with a mouse like selecting text for copying and pasting (涂), drawing, and even scrolling on the page with the newer mice with the wheel. Most of us use the computer mouse daily without stopping to think how it works until it gets dirty and we have to learn how to clean it. We learn to point at things before we learn to speak, so the mouse is a very natural pointing device. Other computer pointing devices include light pens, graphics (图形) tablets and touch screens, but the mouse is still our workhorse.
The computer mouse was invented in 1964 by Douglas Englehart of Stanford University. As computer screens became more popular and arrow keys were used to move around a body of text, it became clear that a pointing device that allowed easier motion through the text and even selection of text would be very useful. The introduction of the mouse, with the Apple Lisa computer in 1983, really started the computer public on the road to relying on the mouse for routine (常规) computer tasks.
How does the mouse work？ We have to start at the bottom, so think upside down for now. It all starts with the mouse ball. As the mouse ball in the bottom of the mouse rolls over the mouse pad, it presses against and turns two shafts (轴). The shafts are conneected to wheels with several small holes in them. The wheels have a pair of small electronic light-emitting devices called light-emitting diodes (LED) mounted on either side. One LED sends a light beam to the LED on the other side. As the wheels spin and a hole rotates by, the light beam gets through to the LED on the other side. But a moment later the light beam is blocked until the next hole is in place. The LED detects (发现) a changing pattern of light, converts the pattern into an electronic signal, and sends the signal (发信号) to the computer through wires in a cable that goes out the mouse body. This cable is the tail that helps give the mouse its name. The computer interprets the signal to tell it where to position the cursor on the computer screen.
So far we have only discussed the basic computer mouse that most of you probably have or have used. One problem with this design is that the mouse gets dirty as the ball rolls over the surface and picks up dirt. Eventually you have to clean your mouse. The newer optical mice avoid this problem by having no moving parts.
Most computer users want to know how the computer mouse works.
A．Right
B．Wrong
C．Not mentioned
A.Gold
B.Green
C.Red
D.Gray
The center line condition of the transmission shaft can be checked by ____.
A.the border flange’s excursion and flection
B.the both end shafts line’s accordance
C.the border flange’s flection and the both end shafts line’s accordance
D.the border flange’s accordance and both end shafts flection degree
With front drive arrangement or rear-wheel-drive arrangement, ______ transmit the power to the drive wheels.
A piston engine
B gears
C gears and shafts
D diesel engine
The clay excavation is______.
A．half a mile underground
B．several miles from Pads, Tennessee
C．worked by miners in shafts several hundred feet down
D．not far from the Kitty Litter plant
Auxiliary machinery covers the steering gear, the turning gear, deck cranes,() and others.
A.main bearings
B.main shafts
C.cargo winches
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