阀门长期关闭,由于锈蚀不能开启,开启此类阀门可采用(),使阀杆与盖母(或法兰压盖)之间产生微量间隙。
A.振打方法
B.扳手或管钳转动手轮
C.加热
D.采用专用工具
参考答案:A
句型转换
例: His eyes are brown.
→ He has brown eyes.
1. Her hair is red.
___________.
2. His eyes are green.
______________.
3. Jack's legs are short.
________________.
4. Jenny's arms are long.
5. Danny's feet are big.
采用何种加工方法金银花中的绿原酸含量最高()
A.阴干
B.晒干
C.蒸后晒干
D.烘干
E.炒炭