Water, when boiled, always ______ steam.

A． gives in

B． gives up

C． gives off

D． gives away

[单选题]In an auxiliary boiler steam and water system, the highest pressure will be in the （）.A . steam stop valveB . dry pipeC . feedwater systemD . generating tube

[单选题]The water level in the gauge glass when a boiler is operating is _____ when the boiler is shut down.A．lower thanB．higher thanC．belowD．equal to

[单选题]When the water produced from most evaporator is supplied for drinking purpose, it must be treated to ensure it is biologically pure and _____.A．slightly acidicB．slightly alkalineC．no saltyD．slightly bitter

[单选题]29． When it thunders, we always see the light before we hear the sound．______ It’s becauseA． our eyes are in front of our earsB． our eyes are cleverer than our earsC． our eyes can see but our ears can-tD．light goes faster than sound

[单选题]People always [turn]to him when they need help.A.turn intoB.turn offC.fall

[单选题]She is always [diplomatic]when she deals with naughty students.A.firmB. tac

[判断题]The forwarders should always arrange for cargo insurance on behalf of theco

[判断题]The forwarders should always book space with the selected carrier on behalf

[判断题]The forwarders should always arrange for cargo insurance on behalf of theco

[判断题]The forwarders should always book space with the selected carrier on behalf