如何防止和处理活塞式膨胀机的“飞车”现象？

小建中汤中芍药的作用是（）

A．养阴而缓肝急 

B．敛营益阴 

C．养血敛阴，柔肝缓急 

D．柔肝理脾，调和气血 

E．以上均非

长期应用糖皮质激素治疗，停药时应注意（）

A、补充蛋白质

B、逐次减量停药

C、检查病人血细胞

D、了解胃粘膜有无损伤

E、服用抗糖皮质激素药物

句型转换。

1. He has studied English for 4 years. (改为一般疑问句)

he_____English for 4 years?

2. My parents have been to America. (就画线部分提问)

_      _parents_____?

3. Lucy's traveled to another province. (改为否定句)

Lucy          to another province.

4. He borrowed the book two weeks ago. (改为同义句)

He has_____the book_____two weeks.

5.I have been here for three months. (改为同义句)

I have been here           three months

宜采用漂法软化的药物是（）

A.半夏

B.槟榔

C.天花粉

D.佩兰

E.陈皮

钢钢焊缝中常见缺陷有哪些？