当高压电动机发生单相接地其电容电流大于（）时，应装设接地保护，可作用于（）或（）。

Scott was not happy. He had no money left to buy the new toy train he wanted. Suddenly,he had an idea! "I’ll ask my brother Alan if I can borrow some money. He always has money to lend peo­ple. "

Scott found Alan in his room. "Alan,may I borrow $20 from you to buy myself a new train?"

Alan replied,"I just spent all of my money on Mom’s birthday present. I have no money left. You are barking up the wrong tree. "

Scott was very disappointed. He decided to get a job. He went to many stores, but no one had a job for him. He walked and walked from store to store.

Finally,he got a job selling ice cream and he was very happy. "My feet are tired for walking all day,but I can get enough money for a toy train. "

小题1:Why did Scott need to borrow money?

A. Because he needed to get a job.

B. Because he wanted to buy a new toy train.

C. Because he wanted to buy a present for his mother.

小题2:The underlined( 划线) phrase "barking up the wrong tree" means______.

A. acting like a dog        B. asking the wrong person      

C. asking the right person

小题3:According to the story, Scott might work in_______.

A. a dessert house  B. a book store   C. a clothing store

小题4:What do you think of Alan?

A. He was unfriendly.    B. He was clever.   C. He was kind.

小题5:What can we know from the story?

A. Scott could get a new train.

B. Scott didn't like his brother.

C. Scott's family was very poor.

牙列缺失多久牙槽嵴的吸收趋于稳定

A．拔牙后2～3个月
B．拔牙后3个月之内
C．拔牙后3～6个月
D．拔牙后1年
E．拔牙后2年

由于电解槽系带电操作，在槽体前操作地面上应放置一块绝缘橡胶板。

单位工程在施工之前，应由多个单位商议确定，其中不包括( )。

A．施工单位
B．建设单位
C．设计单位
D．监理单位

甲持刀抢劫乙的财物，乙乘机把甲打昏在地，随后又把甲杀死。乙的行为（）

A.属于正当防卫

B.属于防卫过当

C.前面是正当防卫，后面是防卫过当

D.前面是正当防卫，后面是故意杀人