搜题请搜索小程序“爱下问搜题”
问题 填空题

经验表明，不高于_________V的电压一般对人体才是安全的。目前，我国家庭电路的电压值为_________V。

答案

36，220

经验表明，不高于36V的电压一般对人体才是安全的。目前，我国家庭电路的电压值为220V

单项选择题

A group of frogs were traveling through the forests, but unluckily two of them fell into a hole. The other frogs tried to help them. When they saw how (16) the hole was, they cried to the two frogs that they could not be saved. The two frogs didn’t (17) and tried their best to jump up out of the hole. The other frogs (18) saying that they were sure to die. (19) ,one of the two frogs, who heard what the other frogs were saying, (20) ,then he fell down and died.
The other frog, however, (21) to jump as hard as he could, and at last made it out. When he (22) , the other frogs asked, "Didn’t you hear us" The frog, who had a poor (23) , explained, "I thought you were encouraging me all the time. "
The story teaches us a (24) : There is power(力量) of life and death in the tongue. An (25) word to those who are down can help them out while a discouraging word can kill them.

Ⅱ. 完形填空/Cloze

A．went on

B．ran away

C．jumped out

D．gave up
查看答案
单项选择题

采用插捣法捣实混凝土拌合物时，如果使用5升的密度筒，需要将拌合物分二层装入密度筒内。则每层的插捣次数是（）次。

A.25

B.35

C.45

D.55
查看答案