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【单选题】
常见食物pH的近似值范围如下： 常见食物 橘子汁 泡 菜 酸牛奶 鸡蛋清 pH （近似值） 3.0～4.0 3.2～3.6 6.3～6.6 7.6～8.0 下列说法中，不正确的是（ ）A.
鸡蛋清显碱性
B.
胃酸过多的人吃泡菜
C.
橘子汁能使石蕊溶液变红
D.
酸牛奶比橘子汁的酸性强
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【判断题】Limited exposure to UVB reduces the skin’s ability to synthesize vitamin D.
A.
正确
B.
错误
【判断题】Limited exposure to UVB reduces the skin’s ability to synthesize vitamin D.
A.
正确
B.
错误
【简答题】Rockets were first used in war in ______ .
【简答题】The ancient Egyptians are supposed ________ rockets to the moon. A) to send B) to be sending C) to have sent D) to have been sending
【简答题】People tend to ignore the delayed effects of exposure to chemical because ________. A) limited exposure to them does little harm to people’s health B) the present is more important for them than the f...
【单选题】Which of the following statements are TURE of limited liability companies?1 The company’s exposure to debts and liability is limited.2 Financial statements must be produced.3 A company continues to ex...
A.
1 and 2 only
B.
1 and 3 only
C.
2 and 3 only
D.
1, 2 and 3
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