The pH value of water in a diesel engine closed cooling water system should be maintained between （）.

A . not under command B . restricted in her ability to maneuver C . engaged in towing D . fishing

A . apogean tide B . double high water C . perigean tide D . bore

A . slightly acidic condition B . slightly alkaline condition C . overtreatment of water D . neutral condition of water

A . An open vent in the cooling system B . A fouled sea chest C . A restricted water passage in the engine D . Air entrained in the cooling water

A . pitch B . sway C . heave D . roll

A . the IP address of the first Fast Ethernet interface B . the IP address of the console management interface C . the highest IP address among its active interfaces D . the lowest IP address among its active interfaces E . the priority value until a loopback interface is configured

A . Once a day B . At the change of every watch C . Only when in fresh or brackish water D . Prior to getting underway

A .  renice -n -20 {PID} B .  renice -n 20 {PID} C .  renice -n -40 {PID} D .  renice -n 40 {PID}

A . Biodegradation B . Dissolution C . Cleaning up by crew with skimmers D . Oxidation including photooxidatio

A . soft water pump was not secured along with the engine B . jacket water thermostat has failed C . cylinder liner may be cracked D . raw water pump is over-speeding just prior to engine shutdow

A . A check constraint on the EMPLOYEE table B . A unique constraint on the EMPLOYEE table WORKDEPT column C . A foreign key reference from the DEPARTMENT tables DEPTNO column to the WORKDEPT column of the EMPLOYEE table D . A foreign key reference from the EMPLOYEE tables WORKDEPT column to the DEPTNO column of the DEPARTMENT table

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

A . starting B . stopping C . to start D . to sto

A . Define a UNIQUE constraint on the columns NEXT_STEPNO and STEPNO. B . Define a CHECK constraint on the NEXT_STEPNO column (NEXT_STEPNO = STEPNO). C . Define column STEPNO as the primary key of TABLEX and column NEXT_STEPNO as a foreign key referencing column STEPNO of the same table. D . Define column NEXT_STEPNO as the primary key of TABLEX and column STEPNO as a foreign key referencing column NEXT_STEPNO in the same table.

A . seawater contamination B . frequent surface blows C . dissolved oxygen deaeration D . frequent bottom blow

A .  @sort  B .  @sort(@thisvalue)  C .  @sortAscending(fieldA)       D .  @sort(“ascesding”;”fieldA”)

A . How invoices are delivered B . Whether a catalog filter should be specified C . Whether order approval is required D . Whether returns are permitted E . Whether the buyer organization has a credit line

A . kg B . MPa C . mH20 D . None of the above

A . relight the boiler immediately to prevent loss of steam pressure B . relight the fire off the brickwork as the bricks are cherry red C . purge the furnace of any combustible gases before attempting to relight the fire D . speed up the feed pump to prevent dry firing when the burner flame is reestablished

A . high density will be on the left in the Northern Hemisphere B . high density will be on the right in the Southern Hemisphere C . low density will be on the left in the Northern Hemisphere D . low density will be on the left in the Southern Hemisphere

A、Illiquidity B、Marketability C、Controlling interest