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【单选题】
塑料包装材料的优点不包括( )。A.
质量轻
B.
耐腐蚀
C.
全部可回收
D.
可塑性强
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举一反三
【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】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】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
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