“合理子组原则’是休哈特提出的控制图基础理论之一。在抽取样本时要使:组内波动仅由()引起的;组间波动主要由()引起的。
参考答案:偶然原因;异常原因
阅读下面短文,按照句子结构的语法性和上下文连贯的要求,在空格处填入一个适当的词或使用括号中词语的正确形式填空。
Why is pink or purple a color for girls and blue or brown for boys?
The answer depends largely 小题1: cultural values as well as personal experiences. To the Egyptians, green was a color 小题2: represented the hope and joy of spring, while for Muslims, it means heaven. Red is a symbol of good luck in many cultures. During the Spring Festival in China, children 小题3: (give) money in a red envelope to bring good fortune in the New Year. For many nations, blue is a symbol of protection and religious beliefs. Greek people often wear a blue necklace hoping to protect 小题4: against evils(灾祸).
People’s 小题5: (choose) of colors is also influenced by their bodies’ reactions toward them. Green is said to be 小题6: most restful color. It has the ability to reduce pain and relax people both mentally 小题7: physically. People 小题8: (work) in green environment have been found to have fewer stomach aches.
Red can cause a person’s blood pressure to rise and increase people’s appetites(食欲). Many decorators will include different shades of red in the restaurant. And many commercial websites will have a red “Buy Now” button because red is a color that 小题9: (easy) catches a person’s eye.
Blue is another calming color. Unlike red, blue is believed to cause people to lose appetite. So 小题10: you want to eat less, some suggest that eating from blue plates can help.
在使用循环语句WHILE[条件表达式]DOm;的时候,必须注意()。
A.需要进行循环的地方
B.每一行都要有顺序号N
C.条件表达式只出现在WHILE语句中
D.要在循环体的适当位置修改条件表达式的值