• 2022-06-06 问题

    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

  • 2021-04-14 问题

    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.

  • 2021-04-14 问题

    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

  • 2022-06-06 问题

    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

  • 2022-11-03 问题

    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

  • 2021-04-14 问题

    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);

  • 2022-07-23 问题

    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

  • 2022-06-01 问题

    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);

  • 2021-04-14 问题

    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);

  • 2022-07-27 问题

    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

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