题目内容
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A(75)system placed between the company network and the outside world may limit outside access to the internal network．
A．firewall
B．modem
C．gateway
D．key
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● A (75) system placed between the company network and the outside world may limit outside access to the internal network.
(75)
A. firewall
B. modem
C. gateway
D. key
A charge![A charge [图] is placed at the origin of a coordin.](http://static.jiandati.com/807c70f-chaoxing2016-955434.png)
is placed at the origin of a coordinate system and a charge![A charge [图] is placed at the origin of a coordin.](http://static.jiandati.com/b3e6691-chaoxing2016-955435.png)
is located at![A charge [图] is placed at the origin of a coordin.](http://static.jiandati.com/df9bde4-chaoxing2016-955436.png)
on the x-axis. The force onis found to be![A charge [图] is placed at the origin of a coordin.](http://static.jiandati.com/3d20c9b-chaoxing2016-955437.png)
. A third charge![A charge [图] is placed at the origin of a coordin.](http://static.jiandati.com/1a6ffa4-chaoxing2016-955438.png)
is now placed at![A charge [图] is placed at the origin of a coordin.](http://static.jiandati.com/7ad28f5-chaoxing2016-955439.png)
on the x-axis. What is the net force onnow？
A、0
B、![A charge [图] is placed at the origin of a coordin.](http://static.jiandati.com/1e7316e-chaoxing2016-955440.png)
C、![A charge [图] is placed at the origin of a coordin.](http://static.jiandati.com/3037338-chaoxing2016-955441.png)
D、![A charge [图] is placed at the origin of a coordin.](http://static.jiandati.com/584fd77-chaoxing2016-955442.png)
An orifice-check valve placed in a hydraulic system is used to .
A.regulate the fluid flow in either direction
B.restrict movement of hydraulic fluid in one direction, but allow free movement in the other direction
C.allow free movement of hydraulic fluid in both directions
D.allow a restricted fluid flow in one direction only
A.160
B.90
C.250
D.180
E.218
F.116G、89H、125
A．firewall
B．modem
C．gateway
D．Key
A.When the helm is at any angle other than amidships
B.When the six-way valve is opened
C.When the ram relief valves lift
D.When the redder angle is different from the position of the helm
The compass(罗盘) is a device that is absolutely necessary for the【56】of ships and airplanes. Hikers often need a compass, too. Anyone who does not use 【57】roads should have a compass.
A compass will always 【58】to know your direction. If you have a map【59】land marks such as roads, mountains, rivers, and lakes, you can immediately find out where you are. The compass 【60】you to place your map in an 【61】position according to the directions. You can then 【62】 where you are with points on the map.
The Chinese were the first people 【63】 the magnet(磁铁)【64】a compass. They first used compasses to 【65】their ships between the years 100 B. C. and A.D. 100. their compasses were simple and 【66】devices.【67】The magnetic iron into their compass, these early seamen placed the magnet on a cork or a piece of straw. They then put the iron-cork system in a bowl of water, the【68】magnet turned easily, aligning(排成列) itself with the directions north and【69】.
Later the Chinese invention was put together【70】a Babylonian invention, the degree. Then the compass became 【71】. Compasses 【72】well on wooden ships.【73】, when metal ships appeared in the 1800s, the simple magnetic compass was【74】. the metal in the ship【75】the magnet. Modem ships now use the gyrocompass and the radio compass for navigation.
(46)
A．judgment
B．operation
C．manufacture
D．accuracy
a grammar school or a secondary school.
B．The present school system can perfectly satisfy the particular needs of each child.
C．Much has been done to improve the students' ability to read and write.
D．English schools have placed sufficient emphasis on broadening the students' horizons.
Header and Footer are strings of text that are placed at the(75) of each page of a document.
A．left or right
B．up or down
C．above or below
D．top or bottom
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