Altocumulus clouds are defined as（）.

1、Cumulonimbus clouds are formed by（）.

Cumulonimbus clouds are formed by（）.Avertical air movementsBheavy rainstormsChorizontal air movementsDany movement of moist air

2、Clouds that form as small white flakes

Clouds that form as small white flakes or scaly globular masses covering either small or large portions of the sky are（）.AcirrusBcirrostratusCaltostratusDcirrocumulu

3、A pump is defined as device that（）

A pump is defined as device that（）Aproduces pressureBimparts energy to a fluid to move it from level ‘A’ to level ‘B’Ccreates a vacuum to move a liquid in all installationDis to develop a pressure differential

4、Linguistics is generally defined as th

Linguistics is generally defined as the scientific study of language.A正确B错误

5、“safe speed” is defined as that speed

“safe speed” is defined as that speed where（）.Ayou can stop within your visibility rangeByou can take proper and effective action to avoid collisionCyou are traveling slower than surrounding vesselsDno wake comes from your vessel

6、Cirrus clouds are composed primarily o

Cirrus clouds are composed primarily of（）.Aice crystalsBwater dropletsCsnow crystalsDnitroge