A cloud of marked vertical development

1、A sign of thunderstorm development is

A sign of thunderstorm development is a cumulus cloud（）.Adarkening，growing in size and forming an anvil topBthat shows extensive vertical developmentCcreating cold downdrafts that are felt on the groundDAll of the above

2、A low，uniform layer of cloud resemblin

A low，uniform layer of cloud resembling fog，but not resting on the ground，is called（）.AcumulusBnimbusCstratusDcirru

3、The vertical movement of a vessel in t

The vertical movement of a vessel in the water is called（）.ApitchBswayCheaveDroll

4、A cloud sequence of cirrus，cirrostratu

A cloud sequence of cirrus，cirrostratus，and altostratus clouds followed by rain usually signifies the approach of a(n)（）.Aoccluded frontBstationary frontCwarm frontDcold front

5、（）is a silvery cloud in the front of f

（）is a silvery cloud in the front of feathers or fibres seen high up against a blue sky.ACirrostratusBCirrusCCirrocmulusDAltostratu

6、A vertical shift of weight to a positi

A vertical shift of weight to a position above the vessel’s center of gravity will（）.Aincrease reserve buoyancyBdecrease the righting momentsCdecrease KGDincrease KM