若am=3,an=2,则an+m= [ ]
A.5
B.6
C.8
D.9
答案:B
If the vertical center of gravity (VCG)of a ship rises 1.7 feet,the righting arm (GZ) for the various angles of inclination will().
A.decrease
B.increase
C.remain unchanged
D.be changed by the amount of GG'x cosine of the angle
为曳引钢丝绳储存润滑油的是()。
A.钢丝
B.绳股
C.绳芯
D.黄油枪