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【单选题】
一装有柴油的船静止于水平面上,船前舱进水,堵住漏洞后用一水泵把前舱的油抽往后舱,如图所示,不的阻力 , 船的运行情况是A.
向前运动
B.
运动
C.
保持静止
D.
无法判断
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【简答题】( ) protocols, such as passwords, PINs, and fingerprint scanners, are the first line of defense against data thieves and snoopers.
【单选题】All of the following are part of the first line of defense against invaders except
A.
tears
B.
saliva
C.
neutrophils
D.
skin
【单选题】Article V of the North Atlantic Treaty calls for NATO members to come to the defense of a fellow member under attack. It was invoked for the first time when __________.
A.
the Soviet Union and East Germany constructed the Berlin Wall
B.
Ethiopia attacked Somalia
C.
Serbs attacked Bosnia in 1994
D.
the United States came under terrorist attack in 2001
【简答题】The_ resistance mechanism, also known as nonspecific resistance,is the first line of defense against any foreign material.
【单选题】Which regulation is the first defense line against acid-base disorder?
A.
blood buffer systems
B.
respiratory regulation
C.
buffering of tissue cells
D.
renal regulation
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