Al（OH）₃中的主要杂质是（）

下面指令执行后,(1)DAW DW 2A05H(2)DAB DB 0FAH (3)MOV AL,BYTE PRT DAW (4)SUB DAB,AL变量DAB中的内容是()。

A、0F5H

B、0F6H

C、0

D、0E65H

A．C₆H₅N

B．C₆H₅NO

C．sub>6H₅NH

D．C₆H₅NH₂

执行下列程序后，AL中的内容为 MOV AL，92H SUB AL，7lH DAS

A.21

B.11

C.21H

D.11H

A．Private Sub Form_Mouse Down(Button As Integer, Shift As Integer,_X As Single,Y As Single If Button=2 Then PopupMenu al,2 End Sub

B．Private Sub Form_Mouse Down(Button As Integer, Shift As Integer,_X As Single, Y As Single PopupMenu al,0 End Sub

C．Private Sub Form_Mouse Down(Button As Integer, Shift As Integer,_X As Single,Y As Single PopupMenu al End Sub

D．Private Sub Form_Mouse Down(Button As Integer, Shift As Integer,_X As Single,Y As Single If(Button=vbLetfButton) Or (Button=vbRightButton) Then PopupMenu al End Sub

A．SiO₂

B． Fe₂O₃

C． Na₂O

D． Al₂O₃

下面有()条指令执行后不会改变目的操作数

1 SUB AL，BL

2 AND AL，BL

3 CMP AL，BL

4 TEST AL，BL

A．一条

B．2条

C．3条

D．4条

B．RPG2

C．RPV2

D．RPH4

B．化验血脂

C．超声心动图

D．肺功能检查

E．心肺吸氧运动试验

F．血电解质检查

B．AUSREP

C．CHISREP

D．JASREP