（）is a measure of the market value of

1、The pH value of water in a diesel engi

The pH value of water in a diesel engine closed cooling water system should be maintained between （）.A60 to75B80 to 95C100 to 115D120 to 135

2、Magnetic dip is a measurement of the a

Magnetic dip is a measurement of the angle between the（）.Ageographic pole and the magnetic poleBlubber's line and true northChorizontal and the magnetic line of forceDcompass heading and the magnetic heading

3、The pitch of a propeller is a measure

The pitch of a propeller is a measure of the（）.Aangle that the propeller makes with a free stream of waterBangle that the propeller makes w...

4、The power factor is a measure of the p

The power factor is a measure of the phase difference between voltage and current and is expressed as the（） of the phase angle.AsineBcosineCtangentDcotangent

5、Pressure gradient is a measure of（）.

Pressure gradient is a measure of（）.Aa high-pressure areaBpressure difference over horizontal distanceCpressure difference over timeDvertical pressure variatio

6、What is the decimal value of the follo

What is the decimal value of the following 8-bit twos complement number? 1111 1001A-7B-3C3D7