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【单选题】
语篇阅读(十五)test 1 话题: 感恩A.
1
B.
2
C.
3
D.
4
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【简答题】Foam is a very effective smothering agent and ______.A. it provides cooling as a secondary effectB. works well on extinguishing electrical firesC. can be used to combat combustible metal firesD. All ...
【单选题】Production of mechanical foam by a portable in-line foam proportioner（）.
A.
increases the size of foam bubbles formed
B.
increases the rate of foam production
C.
improves the extinguishing properties of foam
D.
gives the nozzleman more freedom of movement，since it can be placed anywhere in the hose line
【单选题】Foam is a very effective smothering agent and ______.
A.
it provides cooling as a secondary effect
B.
works well on extinguishing electrical fires
C.
can be used to combat combustible metal fires
D.
all of the others
【单选题】离差是总体各单位的标志值与算术平均数之差。离差的代数和为0,无法进行计算,所以先将各个离差求平方,以消除正负号的影响,然后求平均叫做__________。
A.
方差
B.
平均差
C.
标准差
D.
四分位差
【单选题】Foam is a very effective smothering agent and ______.
A.
it provides cooling as a secondary effect
B.
works well on extinguishing electrical fires
C.
can be used to combat combustible metal fires
D.
All of the above
【单选题】Why is the plan called 'carrot-and-stick' approach?
A.
Because it is very hard to take effect just like a carrot.
B.
Because it is too strict to student athletes just like a stick.
C.
Because it grants rewards and gives penalties together.
D.
Because it gives up a lot and sticks to some basic rules.
【单选题】Foam is a very effective smothering agent and ______.
A.
it provides cooling as a secondary effect
B.
works well on extinguishing electrical fires
C.
can be used to combat combustible metal fires
D.
All of the others
【单选题】One of the limitations of foam as an extinguishing agent is that foam ______.
A.
cannot be made with salt water
B.
is heavier than oil and sinks below its surface
C.
is corrosive and a hazard to fire fighters
D.
conducts electricity
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