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【单选题】
某商场有四类食品,其中粮食类、植物油类、动物性食品类及果蔬类分别有40种、10种、30种、20种,现从中抽取一个容量为20的样本进行食品安全检测。若采用分层抽样的方法抽取样本,则抽取的植物油类与果蔬类食品种数之和是A.
4
B.
5
C.
6
D.
7
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举一反三
【简答题】A．The well. B．The wheels. C．The ears. D．His ears.
【单选题】推行六西格玛管理的目的就是要 I.将每百万出错机会缺陷数降低到3.4 II.提升企业核心竞争力 III.追求零缺陷，降低劣质成本 IV.变革企业文化
A.
(I,II,III)
B.
(I,II,IV)
C.
(I,III,IV)
D.
(II,III,IV)
【单选题】"Trade agreements grease the wheels of importing and exporting". The phrase "grease the wheels" means .
A.
to keep the balance of something
B.
to make something go well or go on smoothly
C.
to interfere with the development of something
D.
to negotiate about something
【简答题】简述 制冷剂的压焓图的“一点”、“三区”、“五态”、“八线”分别是什么含义?
【单选题】We can learn from the text that the wheels of the Grout Portable .
A.
were difficult to separate
B.
could be split into 6 pieces
C.
were fitted with solid tyres
D.
were hard to carry on a train
【单选题】The carried power from the engine crankshaft to the car wheels so the wheels rotate and car moves.
A.
steering system
B.
running system
C.
power train
D.
brake system
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