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【单选题】
食品安全风险评估的核心步骤是( ) A、危害识别(Hazard Identification, HI) B、危害特征描述(Hazard characterization, HC) C、暴露评估(Exposure Assessment, EA) D、风险特征描述(Risk Characterization, RC)
A.
B.
C.
D.
D
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【单选题】听力原文：W: Do you like to run? M: Yeah, when the Police are chasing me. W: You know Kerron Clement? M: Who? W: (9) Kerron Clement. He just broke the world record in the 400-meter. M: Right. W: Did you kn...
A.
To confirm that the student is capable of beating Clement.
B.
To show how sincere he is.
C.
To give an example of how to run fast.
D.
To make a joke about the student's comment.
查看完整题目与答案
【单选题】听力原文：W: Do you like to run? M: Yeah, when the police are chasing me. W: You know Kerron Clement? M: Who? W: Kerron Clement. He just broke the world record in the 400 meter. M: Right. W: Did you know t...
A.
To confirm that the student is capable of beating Clement.
B.
To show how sincere he is.
C.
To give an example of how to run fast.
D.
To make a joke about the student's comment.
查看完整题目与答案
【单选题】听力原文：W: Hi, Rob, you know that class you missed yesterday? M: Yes, but I was seriously iii. W: I'm sorry to hear that. You (:an have my notes. M: Thanks. I appreciate that. W: So how are you feeling? ...
A.
The man's illness.
B.
The effect of antibiotics.
C.
The hobby of the woman's mother.
D.
Their class.
查看完整题目与答案
【单选题】It ________be the vocabulary that caused you the problem in the exercise because you know a lot of words.                                                  (2013·安徽，34)
A.
may
B.
couldn’t
C.
should
D.
needn’t
查看完整题目与答案
【简答题】设函数y=f（x）在（a，b）上的导函数为f′（x），f′（x）在（a，b）上的导函数为f″（x），若在（a，b）上，f″（x）＜0恒成立，则称函数f（x）在（a，b）上为“凸函数”．已知 f(x)= 1 12 x 4 - 1 6 m x 3 - 3 2 x 2 ． （Ⅰ）若f（x）为区间（-1，3）上的“凸函数”，试确定实数m的值； （Ⅱ）若当实数m满足|m|≤2时，函数f（x）在（a，b）上总...
查看完整题目与答案
【单选题】设函数y=f（x）在（a，b）上的导函数为f′（x），f′（x）在（a，b）上的导函数为f″（x），若在a，b）上，f″（x）＜0恒成立，则称函数函数f（x）在（a，b）上为“凸函数”．已知当m≤2时， f(x)= 1 6 x 3 - 1 2 m x 2 +x 在（-1，2）上是“凸函数”．则f（x）在（-1，2）上（　　）
A.
既有极大值，也有极小值
B.
既有极大值，也有最小值
C.
有极大值，没有极小值
D.
没有极大值，也没有极小值
查看完整题目与答案
【简答题】--You know who came yesterday? --Yao Ming?. We had a basketball match. -- ________He came and watched the . A. You guessed it!  B. How did you know that? C. Well done!     D. That was good news!
查看完整题目与答案
【简答题】设函数y=f（x）在区间D上的导数为f'（x），f'（x）在区间D上的导数为g（x），若在区间D上，g（x）＜0恒成立，则称函数y=f（x）在区间D上为“凸函数”已知实数m是常数， f(x)= x 4 12 - m x 3 6 - 3 x 2 2 （1）若y=f（x）在区间[0，3]上为“凸函数”，求m的取值范围； （2）若对满足|m|≤2的任何一个实数m，函数f（x）在区间（a，b）上都为“凸函...
查看完整题目与答案
【单选题】听力原文：W: You know, Brian, it doesn't look like you're vacuumed the living room or cleaned the bathroom. M: No, I haven' t. Ugh. I had the worst day. I am so fired, kook, I promise I'll do it this weeke...
A.
A weekday afternoon.
B.
A weekday evening.
C.
A weekend afternoon.
D.
A weekend evening.
查看完整题目与答案
【单选题】听力原文：W: Mac, what are you doing? M: Making the bed, Liz. W: You know what, Mac? Connie's going to get a face lift. M: Oh? W: She even said she'd get the rest done, too! M: The rest? W: Yeah ! Mac, if ...
A.
She is going to receive a plastic surgery.
B.
She is going to lift something on her face.
C.
She is going to make up for the sake of face.
D.
She is probably going to put on some makeup.
查看完整题目与答案
相关题目：
【单选题】听力原文：W: Do you like to run? M: Yeah, when the Police are chasing me. W: You know Kerron Clement? M: Who? W: (9) Kerron Clement. He just broke the world record in the 400-meter. M: Right. W: Did you kn...
A.
To confirm that the student is capable of beating Clement.
B.
To show how sincere he is.
C.
To give an example of how to run fast.
D.
To make a joke about the student's comment.
查看完整题目与答案
【单选题】听力原文：W: Do you like to run? M: Yeah, when the police are chasing me. W: You know Kerron Clement? M: Who? W: Kerron Clement. He just broke the world record in the 400 meter. M: Right. W: Did you know t...
A.
To confirm that the student is capable of beating Clement.
B.
To show how sincere he is.
C.
To give an example of how to run fast.
D.
To make a joke about the student's comment.
查看完整题目与答案
【单选题】听力原文：W: Hi, Rob, you know that class you missed yesterday? M: Yes, but I was seriously iii. W: I'm sorry to hear that. You (:an have my notes. M: Thanks. I appreciate that. W: So how are you feeling? ...
A.
The man's illness.
B.
The effect of antibiotics.
C.
The hobby of the woman's mother.
D.
Their class.
查看完整题目与答案
【单选题】It ________be the vocabulary that caused you the problem in the exercise because you know a lot of words.                                                  (2013·安徽，34)
A.
may
B.
couldn’t
C.
should
D.
needn’t
查看完整题目与答案
【简答题】设函数y=f（x）在（a，b）上的导函数为f′（x），f′（x）在（a，b）上的导函数为f″（x），若在（a，b）上，f″（x）＜0恒成立，则称函数f（x）在（a，b）上为“凸函数”．已知 f(x)= 1 12 x 4 - 1 6 m x 3 - 3 2 x 2 ． （Ⅰ）若f（x）为区间（-1，3）上的“凸函数”，试确定实数m的值； （Ⅱ）若当实数m满足|m|≤2时，函数f（x）在（a，b）上总...
查看完整题目与答案
【单选题】设函数y=f（x）在（a，b）上的导函数为f′（x），f′（x）在（a，b）上的导函数为f″（x），若在a，b）上，f″（x）＜0恒成立，则称函数函数f（x）在（a，b）上为“凸函数”．已知当m≤2时， f(x)= 1 6 x 3 - 1 2 m x 2 +x 在（-1，2）上是“凸函数”．则f（x）在（-1，2）上（　　）
A.
既有极大值，也有极小值
B.
既有极大值，也有最小值
C.
有极大值，没有极小值
D.
没有极大值，也没有极小值
查看完整题目与答案
【简答题】--You know who came yesterday? --Yao Ming?. We had a basketball match. -- ________He came and watched the . A. You guessed it!  B. How did you know that? C. Well done!     D. That was good news!
查看完整题目与答案
【简答题】设函数y=f（x）在区间D上的导数为f'（x），f'（x）在区间D上的导数为g（x），若在区间D上，g（x）＜0恒成立，则称函数y=f（x）在区间D上为“凸函数”已知实数m是常数， f(x)= x 4 12 - m x 3 6 - 3 x 2 2 （1）若y=f（x）在区间[0，3]上为“凸函数”，求m的取值范围； （2）若对满足|m|≤2的任何一个实数m，函数f（x）在区间（a，b）上都为“凸函...
查看完整题目与答案
【单选题】听力原文：W: You know, Brian, it doesn't look like you're vacuumed the living room or cleaned the bathroom. M: No, I haven' t. Ugh. I had the worst day. I am so fired, kook, I promise I'll do it this weeke...
A.
A weekday afternoon.
B.
A weekday evening.
C.
A weekend afternoon.
D.
A weekend evening.
查看完整题目与答案
【单选题】听力原文：W: Mac, what are you doing? M: Making the bed, Liz. W: You know what, Mac? Connie's going to get a face lift. M: Oh? W: She even said she'd get the rest done, too! M: The rest? W: Yeah ! Mac, if ...
A.
She is going to receive a plastic surgery.
B.
She is going to lift something on her face.
C.
She is going to make up for the sake of face.
D.
She is probably going to put on some makeup.
查看完整题目与答案