Which is true on the subarachnoid space in the vertebral canal（）。

How is the Master or operator of a vessel required to keep the crew informed of the regulations concerning the discharging of garbage overboard?（）.

Through a （） pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.

I don’t think there is too much difference between transiting Suez Canal and panama Canal（）the tonnage certificate required.

In 1979 an extensive（）program was in progress throughout Suez Canal.

Verbal presentation of new words means that the meaning of a second language word is demonstrated through concrete objects, visual aids, or through mime and acting.（）

A declaration made by the Master before a PRC Consul，giving particulars regarding heavy weather or other incidents which may have caused damage to the vessel or cargo，through no fault of the vessel，her officers，or crew is a(n)（）.

In 1978,21989 vessels,including warships（）through the Suez Canal.

Mooring（）are placed on both banks of the Suez Canal about 200m apart.

Through receiving financial support from family, community or the government is allowed, it is never admired.

The cooling of the piston is carried out by circulating （） across the underside of the crown and inside the ring belt or through specially shaped passages.

The （） is used to measure the volume of a liquid or gas through a pipeline within any given period of time.