Which vessel when anchored at night，would not be required to show anchor lights?A.A vessel engaged in underwater operationsB.A vessel engaged in mine clearanceC.A vessel engaged on pilotage dutyD.A vessel engaged in survey operations

One

Two

Three

Four

When at anchor，the pilot vessel is only required to sound anchor signals

The identification signal must be sounded any time the pilot vessel is underway

The pilot vessel may only sound the identity signal when making way

All of the above

During the day，she would display three balls in a vertical line

If making way，she would show masthead lights at night

If at anchor，she need not show anchor lights while displaying identifying lights

Her fog signal would consist of a rapid ringing of a bell for five seconds every minute

two all-round red lights in a vertical line

anchor lights and sidelights

two all-round white lights in a vertical line，sidelights and a stern light

two all-round red lights in a vertical line，sidelights，and a stern light

A sternlight only

Anchor lights only

A white light over a red light only

A white light over a red light and anchor lights

three all-round red lights instead of the lights required for a power-driven vessel of her class

the same lights as a vessel restricted in her ability to maneuver

three all-round red lights in addition to the lights required for a power-driven vessel of her class

the lights for a power-driven vessel which is not under command

only the sternlight of the vessel

a sidelight and one masthead light of the vessel

only a sidelight of the vessel

any lights except the masthead lights of the vessel

when at anchor

only when making way

at any time when underway

only when the identifying lights are not being shown

Three lights in a vertical line，the highest and lowest red and the middle white，and anchor lights

Three lights in a vertical line，the highest and lowest red and the middle white，ONLY

Anchor lights ONLY

Anchor lights and sidelights ONLY

not under command lights

restricted in her ability to maneuver lights

anchor lights

sidelights and a sternlight

By day，she shall carry a black cylinder shape

By day，she shall carry two black balls in a vertical line

By night，she would show the same lights as a vessel not under command

By day，she would show the same shapes as a vessel restricted in her ability to maneuver

making headway

making no headway

moored to a buoy

at anchor

stop the engines

turn off the running lights and turn on the anchor lights

take at least two bearings of prominent shore lights

lower the accommodation ladder and illuminate it

need not show the lights for a vessel engaged in towing，if it is impractical to do so

may show the lights for a vessel not under command

must show a yellow light above the stern light

must show the lights for a vessel towing

when at anchor

only when making way

at any time when underway

only when the identifying lights are not being shown

Masthead lights and sidelights

One sidelight，the masthead lights and stern light

Both sidelights

Stern light

A vessel engaged in underwater operations

A vessel engaged in mine clearance

A vessel engaged on pilotage duty

A vessel engaged in survey operations

the lights required for a power-driven vessel underway

only the required masthead lights

a sternlight only

sidelights and a sternlight

A power-driven vessel

A vessel engaged on pilotage duty

A vessel dredging

A vessel restricted in her ability to maneuver