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【单选题】
实现逻辑运算的( )门电路可以对两种信号进行比较,判断它们是否不同,当两种输入信号不同,输出为1,否则为0。A.
与
B.
或
C.
非
D.
异或
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【单选题】下列细胞，何种常用于检验免疫复合物的实验中
A.
Wil-2cell
B.
Raji cell
C.
HEp-2 cell
D.
HeLa cell
E.
LE cell
【单选题】如果要求分析结果达到0.1%的准确度,使用灵敏度为0.1 mg的天平称取试样
A.
至少应称取：（ ）。
B.
0.1g；
C.
0.2g；
D.
0. 05g；
E.
0.5g。
【单选题】PH 玻璃电极产生酸误差的原因是
A.
玻璃电极在强酸溶液中被腐蚀
B.
H+度高，它占据了大量交换点位，pH偏低
C.
H+ 与H,O形成HO，结果H+降低，pH增高
D.
在酸性较大的溶液中，电极吸附H+， pH增高
【简答题】产品质量和食品安全第一责任人是谁？
【单选题】Judging from the context, itching (line 3, para 2) most probably means______.
A.
afraid
B.
willing
C.
reluctant
D.
eager
【单选题】According to Student 2, as the force of gravity exerted by Earth on a block increases, will the average speed of the block increase or decrease, and why?
A.
Increase, because the weight of the block will increase.
B.
Increase, because the weight of the block will decrease.
C.
Decrease, because the weight of the block will increase.
D.
Decrease, because the weight of the block will decrease.
【单选题】In Paragraph 2, when the author says '...that is only the beginning. ' he means
A.
there will be more heat weaves.
B.
mote people's health will be threatened by heat weaves.
C.
people's health will be more seriously threatened.
D.
there will be more poisonous plants, insects and microbes.
【简答题】谁是食品安全的第一责任人?
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