问题 单项选择题

绝缘工具的检查性试验条件是:将绝缘工具分成若干段进行工频耐压试验,每()mm耐压75kV,时间为1min,以无击穿、闪络及过热为合格。

A.300;

B.700;

C.1000;

D.1500

答案

参考答案:A

完形填空

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。

选项中有两项为多余选项。

Most people know that chocolate is made from cocoa and that the origins of chocolate can be traced back to Central and South America.  小题1: But how did chocolate go from being the food of the gods to being the food of love?

  小题2:  They established the first cocoa plantation and used the cocoa beans as the main ingredient in a dark, bitter drink that we would call “chocolate”. The Mayas believed that chocolate had mystical properties.   小题3: In fact, cocoa beans were used as a form of currency that was worth its weight in gold.

Spanish conquistador Hernando Cortez was the first European explorer to realize cocoa’s commercial possibilities.  小题4:  In 1529, Cortez returned Spain and introduced chocolate——as a drink mixed with sugar, vanilla, and cinnamon——to European society.

It caught on, especially with the nobility. As its popularity spread, people found new ways to make and use chocolate.  小题5:  Whether it is in delectable desserts or crunchy candy, people all over the world are still in love with chocolate.

A. But cocoa also had commercial value.

B. But not all the people all over the world love cocoa.

C. For centuries, the native there regarded cocoa as a gift from the gods.

D. When he arrived in the New World in 1519, he soon established his own cocoa plantation.

E. Around A. D. 600, the Mayas were the main aboriginal group in Central America.

F. These days, chocolate is enjoyed as both a tasty treat and a romantic indulgence.

G. Doctors said cocoa plays an active part in medicine.

单项选择题