船舶上坞或上排时,布墩位置主要是依据:⑴船舶型线图 ⑵外板展开图 ⑶基本结构图 ⑷总布置图
A. (1)(2)
B. (1)(3)
C. (2)(3)
D. (2)(4)
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If the salvor has carried out salvage operations in respect of a vessel which by itself or
A. has earned
B. has failed to earn
C. has rendered
D. has failed to render
修船符号“$”表示:
A. 现场校平或校直
B. 拆装校平或校直
C. 割换
D. 构件割下换新
下列制冷方式,哪种应用最为广泛:
A. 压缩制冷
B. 吸收制冷
C. 真空制冷
D. 半导体制冷
齿轮泵是依靠一对互相啮合的齿轮在回转中发生工作空间的_____变化来产生吸排液体的泵。
A. 位移;
B. 容积;
C. 能量;
D. A+B+C。