更多"（） blow more or less constantly（exc"的相关试题:
[简答题]举例说明cat、more和less命令的用法。
[单项选择]在linux系统中，显示文件命令more和less，默认情况下显示文件（）行。
A. 5
B. 7
C. 9
D. 10
[单项选择]More exact assessment of visibility when（）is used to determine the range of vessel or other objects in the vicinity.
A. radar
B. omega
C. satellite navigator
D. DF
[单项选择]The southeast trade winds actually blow toward the（）.
A. Southeast
B. South
C. East
D. Northwest
[单项选择]Bottom blow valves are installed on auxiliary water-tube boilers to （）
A. completely drain the boiler in an emergency
B. prevent sludge from forming in the drum
C. remove floating impurities from the boiler water surface
D. remove settled solids from the water drum
[单项选择]A conscious victim who has suffered a blow to the head has symptoms that indicate the possibility of concussion. If the patient feels no indication of neck or spine injury，recommended treatment would include（）.
A. turning the victims's head to the side to keep his airway open
B. positioning the victim so the head is lower than the body
C. giving the victim water if he is thirsty，but no food
D. elevating the head and shoulders slightly with a pillow
[单项选择]Diesel engine blow-by is the leakage of combustion gases past the （）
A. oil rings only
B. compression and scraper rings
C. cylinder liner sealings
D. cylinder liner ring grooves
[单项选择]Diesel engine piston ring blow-by is usually caused by excessive ring clearance at the ring（）
A. back
B. side
C. gap
D. bottom
[单项选择]In a diesel engine, blow-by（）
A. increase exhaust back pressure
B. causes excessive crankcase pressure
C. can only be detected by a compression check
D. decreases fuel consumption
[单项选择]Blow-off of the relief valves of the engines cylinders may be caused by （）.
A. too low lead
B. water in fuel
C. too tight spring
D. leakage
[单项选择]Blow-off of the relief valves of the main cylinders during operation indicates （）.
A. the cylinder cover is cracked
B. the injector holes is clogged
C. the cams are not properly set
D. fuel pump is leaking
[单项选择]（） will be used to blow away the combustion products from the tube surfaces.
A. The blow down valve
B. The scum valve
C. The air release cock
D. The soot-blower
[单项选择]The donkey boiler may be given a bottom blow （）
A. to raise water level
B. only while making steam
C. to remove scum
D. when fire are secured
[单项选择]When can routine communications be resumed when radio silence has been imposed?（）
A. After determining that the frequency or channel appears to be no longer in use
B. After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communications
C. Routine communications can resume after the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concluded
D. If，in the Master's opinion，communications on that frequency will interfere with emergency communications
[单项选择]（） will be used to blow away soot and the combustion products from the tube surfaces.
A. The blow down valve
B. The scum valve
C. The air release cock
D. Scot-blower
