A mixture of hydrogen and oxygen

pure oxygen

A mixture of helium and oxygen

Pure filtered compressed air or nitro?

difusion

re-fraction

convection

absorption

dive computer, SSI total dive log, and written dive plan

dive computer and SSI total dive log

dive computer, analog instruments, if the dive computer does not supply all necessary information and SSI total dive log

SSI dive tables and SSI dive log

notify you when a hydrostatic test is due on your high-pressure cylinder

keep all the components of the total dive system to optimal performance

protect the delivery and buoyancy control system

protect the most important system components

breath continuously, ascend slowly and maintain control, and never dive alone or beyond your level of training

maintain neutral buoyancy, breathe continuously, and ascend slowly

regain control, respond, and react

breath continuously, use compressed air only, and the three r rule

within fixed intervals set by local law

after 100 dives

never, no test is required

A minimum of once a year

every month

every year

every five years

every three years

two times

four times

eight times

five times

secured with the valve open

secured and with a minimum of 500 to 750 psi

lying flat with no air

with the valve slightly open to allow air expansion

20

18

30

nine

The delivery system

The buoyancy system

The snorkeling system

The information system

cost, sickness, and seem integrity

cost, quality, and appearance

brandi, availability, and thickness

sickness, fit, and seem integrity

provide serface flotation

all answers are correct

maintain neutral buoyancy during the dive

Control ascent and descent rates

less than

two times

equal to

greater than

buoyancy compensator, exposure suit, and inflation device

buoyancy compensator and inflation device

buoyancy compensator, inflation device, and weight belts or BC weight pockets

regulator, inflation device, and weight belt or BC weight pockets