今年寒假，你将作为一名交换生去美国待一个月，但家里的小猫没有人照料。现在请你给你的朋友Tony 留个短信，请他记得帮忙照顾这只猫。

Dear Tony,

     I am going to the USA in the _____1_____vacation. I will stay there as an _____2_____ student

for one month. Could you please _____3_____after my pet cat?He's very beautiful and cute.  Please

remember to _____4_____ him three times a day and clean his bed .  Take him _____5_____ a walk

if you have time.  I will bring you beautiful gifts when I come back. See you next month!

                                                                                                                                         Thanks,

                                                                                                                                          Lucy

统调火电最大出力受阻容量是指机组最大可调出力与并网调度协议明确的最大发电能力的差额，包括机组缺陷、（）等。

A.环境影响

B.供热

C.煤质差

D.升压站缺陷

E.一次能源不足