关于腐蚀性食管灼伤，下列叙述中哪一项是错误的A．Ⅰ度烧伤一般不会造成食管瘢痕狭窄 B

l. Next to Simon's high school is a river that is 30 meters wide. Students can cross the river by walking

over a bridge. One-fifth of the length of the bridge goes over land on one side of the river, and one-fifth

of the length of the bridge goes over land on the other side of the river. What is the total length of the

bridge?

Answer: _                                                                        

2. There is a new film,  the price of which is 20 dollars for each adult and 10 for each child; if you buy

three tickets or more you will have a 10% discount; Susan, a primary school student, together with her

parents is going to see the film. How much will they pay?

Answer: _                                                                        

IP承载网，PE边缘路由器设备一般为（）

A、CR

B、BR

C、AR

D、CE

水闸的特别检查是指（）。

A、在经常检查中对水闸个别部位进行的重点检查

B、在汛期必须对工程进行特别检查

C、当水闸遭受特大洪水、风暴潮、强烈地震和发生重大工程事故时，必须及时对工程进行特别检查

D、在枯水季节必须对工程进行特别检查

旅客托运行李丢失或损坏，不论由于何种事故引起的，应视为（）除非承运人或港口提出（）。

A、事故；证据

B、过失；证据

C、过失；反证

柴油机滑油压力太低会使（）

A、滑油温度降低

B、滑油温度升高

C、滑油温度不变