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【单选题】
液体类量具包括( )。A.
量提和液压表
B.
仪表和标准容器
C.
售油计量器和量提
D.
量提和售油计量器
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皮皮学刷刷变学霸
举一反三
【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】As she______the newspaper, Granny______asleep.
A.
read.., was falling
B.
was reading.., was falling
C.
read...fell
D.
was reading.., fell
【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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