从下列句子中选出感叹句。

A. How beautiful the flowers are!

B. She didn't bring me her book.

C. Come in please!

D. Let me try.

E. What a fine day!

F. Put the pears in the box.

G. How good the teacher is!

H. Do come again, please!

是感叹句的有: _____________________________________________

加油机显示板在提枪或放枪时有跳数现象，引发此故障的可能原因是（）。

A、止回阀弹簧弹力过弱

B、单光电板损坏

C、接线板上+12V、+5V电源电压偏低

D、泵内刮片、弹片磨损，断裂