题目内容

下列浓度相同的盐溶液中pH值最高的是()。

A. NaCl
B. K2CO3
C. Na2SO4
D. Na2S

查看答案
更多问题

如图所示结构中两杆的材料相同,横截面面积分别为A和2A,则该结构的许用载荷是 ()。

A. [F]=A[σ]
B. [F]=2A[σ]
C. [F]=3A[σ]
D. [F]=4A[σ]

According to the speaker, what was most likely held by children in family portraits?

A. Their playings.
B. Some money.
C. Their relatives' hands.
D. Their shoes.

股票X和股票Y,这两只股票下跌的概率分别为.4和0.5,两只股票至少有一只下跌的概率为0.7,那么,这两只股票同时下跌的概率为()。

A. 0.9
B. 0.7
C. 0.4
D. 0.2

According to the speaker, what do most people think historians are concerned with?

A. Portraits as clues to our past.
B. Prominent families in history.
C. Twentieth century photographers.
D. A new generation of artists.

答案查题题库