A． gives in
B． gives up
C． gives off
D． gives away
The engine________smoke and steam．（ ）A. gives upB. gives inC. gives awayD. gives
[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
After a day at work, I like to put some music on, dance around and let __ steam.
When heated, water changes into ( ).A. solidB. vapourC. liquidD. air
[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
A _ addiction to money may not always be hurtful， but when taken in excess ，it i
[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
When a pencil is partly in a glass of water, it looks as if it__________.A. brea
[单选题]People always [turn]to him when they need help.A.turn intoB.turn offC.fall