The effect of α2 receptor include
A、inhibit the contraction of cardiac muscle.
B、increae of the heart rate.
C、dilation of the resistance vessels.
D、increse the amount of urine.
E、decresae the release of neurotransmitter at presynaptic terminals.
A、inhibit the contraction of cardiac muscle.
B、increae of the heart rate.
C、dilation of the resistance vessels.
D、increse the amount of urine.
E、decresae the release of neurotransmitter at presynaptic terminals.
What is the name of an electronic document?
(1)( ) electronic record
(2)( ) acknowledgement of receipt
#include <stdio.h> typedef struct {int num;double s;} REC; void fun1(REC x) {x.num=23;x.s=88.5;} main() { REC a={16,90.0}; fun1(a); printf("%d ",a.num); } 上述程序的输出结果为 ________
A、16
B、23
C、90
临界雷诺数Rec≤2 000时,流动状态为()。
A.层流
B.紊流
C.临界状态
D.静止状态
A.char no[30],rec[30,6];
B.static int a[5],b[2][3];
C.int x[]={2,4,6,8,10};
D.int x[10]={1,2,3,4,5};
(28 )若在窗体模块的声明部分声明了如下自定义类型和数组
Private Type rec
Code As Integer
Caption As String
End Type
Dim arr (5 ) As rec
则下面的输出语句中正确的是
A ) Print arr.Code (2 ) ,arr.Caption (2 )
B ) Print arr.Code,arr.Caption
C ) Print arr (2 ) .Code,arr (2 ) .Caption
D ) Print Code (2 ) ,Caption (2 )
若在窗体模块的声明部分声明了如下自定义类型和数组
Private Type rec
Code As Integer
Caption As String
End Type
Dim art(5)As rec
则下面的输出语句中正确的是
A.Print arr.Code(2),an.Caption(2)
B.Print arr.Code,arr.Caption
C.Print arr(2).Code,arr(2).Caption
D.Print Code(2),Caption(2)
若在窗体模块的声明部分声明了如下自定义类型和数组:
Private Type rec
Code As Integer
Caption As St ring
End Type
Dim art(5)As rec
则下面的输出语句中正确的是()。
A.Print arr.Code(2),art.Caption(2)
B.Print art.Code,arr.Caption
C.Print arr(2).Code,arr(2).Caption
D.Print Code(2),Caption(2)
有程序:ADD(X,Y)=X**2+Y 0PEN(8,FILE=‘F’,STATUS=‘NEW’,ACCESS=‘DIRECT’,*FORM=‘UNFORMATTED’,REAL=l6 D0 10 I=1,4 D=ADD(REAL(I),2、0)WRITE(8,REC=I)D 10 CONTINUE CLOSE(8) OPEN(2,FILE=‘F’,STATU=‘0LD’,ACCESS=‘DIRECT’, * FORM=‘UNFORMATTED’,REAL=6 D020I=2,4,2 READ(2,REC=I)C WRITE(*,30)C 20 CONTINUE 20 FORMAT(1x,F4.1) CLOSE(2) END 执行此程序的结果是:
A.3.0 11.0
B.6.0 11.0
C.6.0 11.0
D.11.0 18.0
有一个晶闸-电动机调速系统,已知:电动机:PN=2.8kW,UN=220V,IN=15.6A,nN=1500r/min,Ra=1.5欧,整流装置内阻Rec=1Ω, 电枢回路电抗器电阻RL=0.8, 触发整流环节的放大倍数Ks=35。 (1)系统开环工作时,试计算调速范围D=30时的静差率值。 (2)当D=30,s=10%时,计算系统允许的稳态速降。 (3)如组成转速负反馈有静差调速系统,要求D=30,s=10%,在Un*=10V时Id=IN,n=nN,计算转速负反馈系数Alpha和放大器放大系数Kp
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