A direct current passing through a wire coiled around a soft iron core is the description of a simple().
- Amagnetic shield
- Belectromagnet
- Cpiezoelectric device
- Delectromagnetic domai
A direct current passing through a wire coiled around a soft iron core is the description of a simple().
1、Current flowing in only one direction
Current flowing in only one direction is called ()Aalternating currentBomnidirectional currentCdirect currentDsinusoidal current
2、As the refrigerant passes through the
As the refrigerant passes through the valve orifice, its pressure is reduced and part of the refrigerant turns into ().AliquidBoily mixtureCemulsionDvapor
3、After passing through the expansion va
After passing through the expansion valve the refrigerant should be in the state of ().AvaporBliquidCsolidDNone of the above is tree
4、When the current flow through a copper
When the current flow through a copper wire increases, its ()Aresistance will decreaseBinsulation will bumCtemperature will increaseDconductivity will increase
5、Where a propeller shaft passes through
Where a propeller shaft passes through the hull,water is prevented from entering by means of a().Astuffing boxBpropeller bossCseacockDstop-water
6、A disk with a horizontal line through
A disk with a horizontal line through its center, equivalent to the summer load line, is called the().Adeadrise markBmaximum alloable draft markCpilmsoll markDtonnage mark