搜题请搜索小程序“爱下问搜题”
问题 单项选择题

下列程序执行时，需输入数据的记录个数必须为（）DIMENSIONA(4，4)READ(*，*)AEND

A.1个

B.4个

C.16个

D.不超过l6个

答案

参考答案：D

解析：每个记录最少可以为1个数据。

单项选择题

已知下列相同浓度的盐的pH值，由大到小的顺序是KA、KB、KC、KD（A、B、C、D都为弱酸根），则各对应的酸在同温度下，解离常数最大的是（）。

A.HA

B.HB

C.HC

D.HD
查看答案
单项选择题

Why have the Americans developed space shuttle according to the passage

Which of the following statements is NOT true according to the passage

A．The term "averted vision" refers to the act of looking out of the comers of one’s eyes.
B．If you want to see very faint things, you should better look sideways rather than straight on.
C．The receptors located in the eye’s center are less sensitive to dim light.
D．To "look" is to see something straight ahead.
查看答案