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【单选题】
苯巴比妥在90%的乙醇溶液中溶解度最大,则90%的乙醇溶液是苯巴比妥的:A.
消毒剂
B.
助溶剂
C.
增溶剂
D.
潜溶剂
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【简答题】某灯泡厂对正在生产的产品（灯泡）进行使用寿命检验，使用时间1000小时以下的为不合格品。随机抽取200个样本单位组成一个样本进行测试。结果如下：使用时间（小时）样本单位数（个）使用时间（小时）样本单位数（个）900以下900-950950-10001000-10502411711050-11001100-11501150-12001200以上841873合计200计算灯泡的平均使用时间为_____...
【简答题】某灯泡厂对正在生产的产品（灯泡）进行使用寿命检验，使用时间1000小时以下的为不合格品。随机抽取200个样本单位组成一个样本进行测试。结果如下：使用时间（小时）样本单位数（个）使用时间（小时）样本单位数（个）900以下900-950950-10001000-10502411711050-11001100-11501150-12001200以上841873合计200计算灯泡使用寿命的样本标准差为__...
【简答题】指出下列哪些函数是指数函数? (5.0分)A. B. C. D. E. F.
【单选题】听力原文：M: What do you think of Professor Brown's lecture? W: The topic was interesting, but the lecture was much more difficult to follow than I had expected. Q: What does the woman say about the lectur...
A.
It was a long lecture, but easy to understand.
B.
It was not as easy as she had thought.
C.
It was as difficult as she had expected.
D.
It was interesting and easy to follow.
【单选题】听力原文：M: Do you want to go to the lecture this weekend? I hear the guy who's going to deliver the lecture spent a year living in the rain forest. W: Great! I'm doing a report on the rain forest. Maybe ...
A.
She knows the guy who will give the lecture.
B.
She thinks the lecture might be informative.
C.
She wants to add something to her lecture.
D.
She'll finish her report this weekend.
【单选题】听力原文：M: Do you want to go to the lecture this weekend? I hear that the guy who is going to deliver the lecture spent a year living in the rainforest. W: Great, I am doing a report on the rain forest. ...
A.
She knows the guy who will give the lecture.
B.
She thinks the lecture might be informative.
C.
She wants to add something to her lecture.
D.
She'll finish her report this weekend.
【单选题】听力原文：M: What do you think of Professor Brown's lecture? W: The topic was interesting, but the lecture was much more difficult to follow than I had expected. Q: What does the woman say about the lectur...
A.
It was a long lecture, but easy to understand.
B.
It was not as easy as she had thought.
C.
It was as difficult as she had expected.
D.
It was interesting and easy to follow.
【简答题】下列函数哪些是指数函数?A. B. C. D. E. F.
【简答题】某灯泡厂对正在生产的产品（灯泡）进行使用寿命检验，使用时间1000小时以下的为不合格品。随机抽取200个样本单位组成一个样本进行测试。结果如下：使用时间（小时）样本单位数（个）使用时间（小时）样本单位数（个）900以下900-950950-10001000-10502411711050-11001100-11501150-12001200以上841873合计200计算灯泡使用时间的抽样平均误差为_...
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