How to produce ultrasound wave? A: negative piezoelectric effect of transducer B: Piezoelectric effect of transducer C: Thermal effect of transducer D: The magnetic effect of transducer
How to produce ultrasound wave? A: negative piezoelectric effect of transducer B: Piezoelectric effect of transducer C: Thermal effect of transducer D: The magnetic effect of transducer
The operation of and design approaches to mechanical and piezoelectric(压电的) electric wave filters(滤波器) are discussed.
The operation of and design approaches to mechanical and piezoelectric(压电的) electric wave filters(滤波器) are discussed.
The_______is a crystal which, under pressure, produces an electric current which varies with the pressure A.alternator B.glass thermometer C.bourdon tube D.piezoelectric pressure transducer
The_______is a crystal which, under pressure, produces an electric current which varies with the pressure A.alternator B.glass thermometer C.bourdon tube D.piezoelectric pressure transducer
A<br/>piezoelectric crystal is used to produce the ultrasound waves. What<br/>kind of ultrasound is produced? () A: Pressure<br/>wave ultrasound B: Electrical<br/>wave ultrasound C: Sound<br/>wave ultrasound D: Simple<br/>ultrasound
A<br/>piezoelectric crystal is used to produce the ultrasound waves. What<br/>kind of ultrasound is produced? () A: Pressure<br/>wave ultrasound B: Electrical<br/>wave ultrasound C: Sound<br/>wave ultrasound D: Simple<br/>ultrasound
如果ξ与η不相关,则()。 A: D(ξ+η)=Dξ+Dη B: D(ξ-η)=Dξ-Dη C: D(ξη)=Dξ·Dη D: E(ξη)=Dξ·Dη
如果ξ与η不相关,则()。 A: D(ξ+η)=Dξ+Dη B: D(ξ-η)=Dξ-Dη C: D(ξη)=Dξ·Dη D: E(ξη)=Dξ·Dη
已有定义intd=-2;,执行以下语句后的输出结果是:printf('*d(1)=%d*d(2)=%3d*d(3)=%-3d* ',d,d,d,d);printf('*d(4)=%o*d(5)=%7o*d(6)=%-7o* ',d,d,d,d);printf('*d(4)=%x*d(5)=%6x*d(6)=%-6x* ',d,d,d,d);
已有定义intd=-2;,执行以下语句后的输出结果是:printf('*d(1)=%d*d(2)=%3d*d(3)=%-3d* ',d,d,d,d);printf('*d(4)=%o*d(5)=%7o*d(6)=%-7o* ',d,d,d,d);printf('*d(4)=%x*d(5)=%6x*d(6)=%-6x* ',d,d,d,d);
圆柱螺旋弹簧的旋绕比C是() A: d/D B: d/D C: D/d D: D/d
圆柱螺旋弹簧的旋绕比C是() A: d/D B: d/D C: D/d D: D/d
已有定义int d= –2;执行以下语句后的输出结果是。 printf(" * d(1) =%d * d(2)= %3d * d(3) =% –3d * ",d,d,d); printf(" * d(4) =%d * d(5)= %7d * d(6) =% –7d * ",d,d,d);
已有定义int d= –2;执行以下语句后的输出结果是。 printf(" * d(1) =%d * d(2)= %3d * d(3) =% –3d * ",d,d,d); printf(" * d(4) =%d * d(5)= %7d * d(6) =% –7d * ",d,d,d);
若有说明语句:int a,b,c,* d=&c;,则能正确从键盘读入三个整数分别赋给变量a、b、d的语句是 ( ) A.scanf("%d%d%d",&a,&b,d); B.scanf("%d%d%d",&a,&b,&d); C.scanf("%d %d%d",a,b,d); D.scanf("%d%d%d",a,b,* d);
若有说明语句:int a,b,c,* d=&c;,则能正确从键盘读入三个整数分别赋给变量a、b、d的语句是 ( ) A.scanf("%d%d%d",&a,&b,d); B.scanf("%d%d%d",&a,&b,&d); C.scanf("%d %d%d",a,b,d); D.scanf("%d%d%d",a,b,* d);
如果要用JK触发器来实现D触发器的功能,则J=( ),K=( )。 A: D;D' B: D;D C: D';D' D: D;D
如果要用JK触发器来实现D触发器的功能,则J=( ),K=( )。 A: D;D' B: D;D C: D';D' D: D;D