典型的活塞杆密封有那些?
参考答案:
(1)O形圈
(2)Y形圈
(3)现代U杯形密封
(4)聚四氟乙烯同轴密封
有一个事件过程,其功能是:从已存在于磁盘上的顺序文件NMl.txt中读取数据,计算读 出数据的平方值,将该数据及其平方值存入新的顺序文件NM2.txt中。请填空。Private Sub Form_Click() Dim x As Single,y As Single Open "NMl.txt" For Input As #1 Open "NM2.txt" For Input As #2 Do While Not EOF(1) 【】 Print x y=x^2 【】 Print x Loop Close #1,#2 End Sub
Which of the following methods would the nurse use to feed an infant after surgical repair of cleft lip
A.Gastric gavage.
B.Intravenous fluids.
C.Rubber-tipped medicine dropper.
D.Bottle with a lamb's nipple.