根据下列短文内容选择最佳答案完成句子。  

      Look at this. It’s a pencil case. It’s orange. It’s my pencil case. What’s in it? Look, this is a pen. It’s

black. This is a pencil. It’s red. And this is a pencil, too (也). It’s yellow. This is an eraser. It’s blue and

white. My pencil case is big and nice. I like it.

1. The pencil case is ________.  

A. small        

B. nice      

C. red

2.  ________ are in the pencil case.  

A. A pen and a yellow eraser    

B. Two pencils    

C. A blue eraser and a white pen

3. The pen is ________.  

A. red          

B. yellow    

C. black

4. My ________ is orange.  

A. pencil case    

B. pencil    

C. pen

5.                  isn’t in the pencil case.  

A. A pen        

B. A pencil sharpener    

C.An eraser

已知变压器型号为S9-6300，U_N=35kV，U_d%=7.5%。35kV架空线路长为100km，x₀= 0.4Ω/km，10kV电抗器的百分电抗X_k%=3%，额定电流I_N=150A。试求在基准容量
s_j=100MV·A、基准电压U_j=10.5kV条件下，上述三元件的电抗标幺值。