________had the worker who was badly inj

读短文，判断正(T)误(F)。

      I'm Peter. My father and I are in the living room. My mother is in the kitchen. She is cooking. I like peas

and carrots. My mother likes cabbages and fish. My father likes beef and onions. We would like some rice,

peas and onions for dinner. Oh! Dinner is ready!

( ) 1. Peter likes cabbages and peas.

( ) 2. His father likes beef and onions.

( ) 3. His mother is cooking.

( ) 4. Mother and I are in the kitchen.

( ) 5. They will eat rice, peas and onions for dinner.

（6分）．如图所示，电源电压为60V，A、B两板相距30cm，B板接地，C点离A板10cm，D点离B板5cm，求C、D两点的电势各为多少？

花键装配完成后，用手左右晃动时应感到有间隙。

正常输尿管有几个生理性狭窄（）

A.3个狭窄

B.2个狭窄

C.5个狭窄

D.4个狭窄

E.6个狭窄

避雷器的持续运行电压是允许持久地施加在避雷器端子间的工频电压有效值。一般相当于避雷器额定电压的（）。

A.25%～30%

B.45%～50%

C.75%～80%

D.95%～100%