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【单选题】
某商场有四类食品,其中粮食类、植物油类、膨化食品类和类分别为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类种数之和是( )A.
4
B.
5
C.
6
D.
7
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皮皮学刷刷变学霸
举一反三
【单选题】- Why did you come here so late? - Sorry. I the bus.
A.
took
B.
caught
C.
got on
D.
missed
【单选题】听力原文：Why did you leave our company so early yesterday? (A) Because you worked so late. (B) I am always the first person here. (C) I left to see the doctor. (11)
A.
B.
C.
【单选题】听力原文：W: I have been waiting here for almost half an hour. Why did you take so long to park the car? M: I'm sorry, dear. I had driven two blocks before I found a place to park. Q: What can we learn fro...
A.
The man couldn't find a parking lot.
B.
It's hard to find a place to leave the car.
C.
The woman was upset due to his late arrival.
D.
The man apologized because of his negligence.
【简答题】I: So, why did you ___ our company?
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