Black areas on the sealing surfaces of piston rings indicate＿.

A . O-ring B . gasket C . washer D . packing

A . In the Coast Pilot B . In the Nautical Almanac C . In the List of Lights D . In the Sailing Directio

A . pawls B . sockets C . pockets D . devil's claw

A . location and capacity of the facilities located on board ships B . Position and type of a sincere sintion C . Capacity and location of shore based communication facilities D . Position and capacity of mobile communication statio

A、Top center B、Lower-left corner C、Part of the chart title D、Any clear area around the neat line

A . Equator B . Areas including both North and South latitudes C . North and South Poles D . A narrow band along the central meridia

A . annular blowout preventer B . annulus C . accumulator D . automatic choke

A . graphite packing B . sealing compound C . lubricating oil D . gasket

A . LOGICAL_READS_PER_SESSION  B . CONNECT_TIME  C . COMPOSITE_LIMIT  D . CPU_PER_SESSION  E . PRIVATE_SGA

A . camshaft B . flywheel C . crankshaft D . thrust shaft

A . combustion gas blow-by B . excessive lubrication C . properly functioning rings D . insufficient cylinder cooling

A . insufficient lubrication B . improper piston cooling C . blow-by D . overload operatio

A . prevailing westerlies B . geostrophic winds C . doldrums D . horse latitude

A . north side of the mark B . west side of the mark C . east side of the mark D . south side of the mark

A . the kind of OSPF areas being implemented B . the number of external LSAs in the network C . the number of DRs and BDRs in the areas D . the number of virtual links in the areas E . how well the areas can be summarized F . the use of LSA filter

A . Area 0 B . NSSA C . Totally stubby D . Stu

A . Prohibit to anchor B . Prohibited to anchor C . Prohibited from anchor D . Prohibited from anchoring

A．the idea that the seals coming to American shores were American property B．the idea that they were international arbitrators C．the fact that the United States had purchased all the waters off Alaska D．the fact that the United States had special rights for open-ea areas

The average height of the land is about 750 metres above the sea level. The Eurasian(欧亚大陆的) land mass is the largest with an area of 54,527,600 square kilometers. The smallest continent is the Australian mainland, with an area of about 7,614,600 square kilometers, which together with Tasmania, New Zealand, New Guinea and the Pacific Islands, is described as Oceania.The total area of Oceania is about 8,935,500 square kilometres, including West Iran which is political in Asia. The world's largest peninsula(半岛) is Arabia, with an area of about 3,327,500 square kilometres. The largest island in the world is Greenland, with an area of about 2,175,600 square kilometres. The largest island surrounded by fresh water is the Ilha de Marajo (4,022 square kilometres) in the mouth of the Amazon River, Brazil. The largest island in a lake is Manitoulin Island (2,766 square kilometres) in the Canadian section of Lake Huron. This island itself has on it a lake of 106 square kilometres called Manitou Lake, in which there are several islands. 1)、The total area of the world is about 211 million square kilometers. A.T B.F 2)、The area of Tasmania, New Zealand, New Guinea and the Pacific Islands adds up to about 1,320,900 square kilometres. A.T B.F 3)、Oceania is made up of Australia, New Guinea and the Pacific Islands. A.T B.F 4)、As mentioned in the passage there are several islands in Manitou Lake. A.T B.F 5)、The largest island surrounded by fresh water is in a river. A.T B.F

是 否