频率为32.768KHZ贴片晶体MC-146用在工控机上，请问MC-146表面丝印代表什么意思？

MC-146 32.768000 KHz 12.5 +/-20.0 - PSN

MC-146 32.768000 KHz 6pF +/-20.0ppm

"MC-146 32.768KHZ 7pf +/-20.0ppm"

MC-146 32.768000 KHz 7PF 20PPM LF

MC-146 32.768KHZ 7pf +/-20.0ppm

MC-146 32.768000KHz 12.5 +10.0-10.0

MC-146 32.768000 KHz 7PF 20PPM LF

RX-8010SJ B

RX8130 CE

FC-135R 32.768000 kHz 6.0 +20.0-20.0

FC-12M 32.768KHz 12.5+20.0-20.0(F)

MC-306 32.768000 KHz 12.5 +20.0-20.0

MC-306 32.768000 KHz 6.0 +20.0-20.0

RX8900CE UB

RX-8025SA AC 0+- 5ppm

MC-306 32.768000 KHz 6.0 +20.0-20.0

FA-20H 20.000000MHz 10.0 +10.0-10.0

SG-210SEH 125.000000MHz L

RA-8565SA B

MC-146 32.768000KHz 12.5 +10.0-10.0

SG7050CAN 12.000000 MHz TJGA

SG3225HBN 156.250000MHz CJGA

RESISTOR FLANGE MOUNT 10 WATT

MC-146 32.768000KHz 6.0 +10.0-10.0

"SG-3030CM 32.768000 KHz B"

SG7050CCN 20.000000 MHz HJGA

SG3225VAN 125.000000MHz KEGA

CS TR5/TE5 SMALL HOLDER

MA-406 4.000000 MHz 16.0 +50.0-50.0

FC-135 32.768000 kHz 6.0 +5.0 -5.0

FC-12M 32.768KHz 7PF+20-20

FC-13A 32.768KHz 12.5pF 20ppm

FC-12M 32.768000 kHz 6.0 +20.0-20.0

SG-211SCE 25.000000 MHz H

SG-3030LC 32.768000 KHz B

MC-146 32.000000 kHz 12.5 +50.0-50.0

SG5032VAN 150.000000MHz KJGA

Intellgent Power Devices

矩形连接器 - 弹簧式

FC-12M 32.768000 KHz 9.0 +20.0-20.0

TG2520SBN 19.200000 MHz MCGNEM..

SG3225HBN 156.250000MHz CJGA..

MC-405 32.768000KHz 12.5PF 20PPM LF Lead-Free(for RoHS)

SG-8002CE 14.7456Mhz PH L

RX-8581SA B

"TG-5035CE-22N 26.000000 MHz"

SG-310SEF 50.000000 MHz L

TG2520SBN 19.200000 MHz MCGNEM..

Enhancement Mode Power Transistor,Single

C-002RX 32.768KHz 6pf 20pm

SG-8018CG BLANKSAMPLE..

FUSE 250V IEC TL TE5 LL AMMO 2A

SG5032VAN 200.000000MHz KJGA

FC-13A32.768000kHz12.5+20.0-20.0

SG5032VAN 148.500000MHz KEGA

SG7050CAN 12.288000MHz TJGA

SG-310SCN 33.330000MHz J

SG5032VAN 156.250000MHz KJGA

RX-4571SA B

SG-3030JF 32.768000 KHz B

SG7050EAN 125.000000MHz KEGA

"MC-146 32.768000 KHz 12.5 +/-20.0 - PURE SN　"

MC-406 32.768000 KHz 12.5 +20.0-20.0 LF

SG7050VAN 125.000000MHz KEGA

FUSE 125V SB NANO2 W/Au CAPS RoHS 1A

MC-146 32.768000KHz 6.0 +10.0-10.0

RX-4581NB B

VG7050CDN 153.6MHZ CJGHB

SG-8018CA BlankSample..

SG5032CBN 133.000000MHz TJGA

FC-12M 32.768000 KHz 12.5 +20.0-20.0

TG5032SGN 19.200000MHz CAGHDA

MC-156 32.76800 KHz 12.5

SG-8018CB BlankSample..

SG7050VAN 125.000000MHz KJGA

SG5032CBN 100.000000MHz TJGA

SG-8018CE BLANKSAMPLE..

晶振,RTC（32.768KHz）

FC-13A 32.768KHz 12.5pF

FC-12M 32.768000 kHz 6.0 +20.0-20.0

SG5032CBN 133.000000MHz TJGA

32-BIT GENERAL MCU

SG5032CBN 125.000000MHz TJGA

TG-5021CE-13A 26MHz

VG7050CDN 153.6MHZ CJGHB

VG7050CDN 153.6MHz

RX-4581NB B

MC405-32.768K,±20PPM,12.5pF

RX8900SA UB

SG-8018CA BlankSample

SG-8018CE 100MHz BlankSample

RX-8571LC B

SG7050CAN 12.000000 MHz TJGA

SG-8002LB BLANK (LF)

SG5032CAN 20.000000 MHz TJGA

MC-306 32.768000KHZ 12.5PF 10PPM LF

"SG7050CAN 48MHZ +/-50ppm (-40~+85°C)　"

SG-8003CA Blank Samples

SG-3030JF 32.768000 KHz B

RX-8803SA UB