企业应保存5年的会计档案有（）。

Please don't Bobby when he you.

A、 turn down turns to

B、 turn away from turns into

C、 turn off turns up

D、 turn out turns over

When is the density of the water required to be logged in the logbook of a ship？

A.Any time the vessel moves from water of one density into waters of a different density

B.Prior to getting underway when the vessel is floating in fresh or brackish water

C.Only when the vessel moves from fresh water into salt water

D.The density of the water is not required to be logged in the unofficial logbook

When heated, water changes into _______.

A、solid

B、vapour

C、liquid

D、air

When water(), it will be changed into vapour.

A. is heated

B. was heated

C. will be heated

D. would heated

Water always ______ steam when boiled.

A．gives out

B．gives up

C．gives off

D．gives in

A) turns up

B) turns over

C) turns in

D) turns down

When a pencil is partly in a glass of water, it looks as if it ______.

A．breaks

B．has broken

C．were broken

D．had been broken