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沉积层是指惰性膜沉积在石英砂粒外围的物质。沉积层有细粒物质、死粘土和灰分，牢固地聚集在砂粒上形成一层不平的外表层，使砂粒流动性能降低，型砂传递能量的效率减小，砂型紧实度不匀。
沉积层来源有大小河流携带到海中的土壤和基岩物质。在冰川溶化期，这种基岩物质就被带入大海，或者被风吹送到海中去。沉积层的其他来源是火山灰与熔岩、贝壳与生物骨骼、在海水中形成的化学沉积物以及宇宙尘埃等。
MC68HC711E20CFNE2
MC74AC04DR2G
MC74AC541DWR2G
CY7C1413KV18-250BZC
MC78L05ACDR2G
MCP1416T-E/OT
MCP2210T-I/MQ
MCP23S17T-E/ML
MCP3008T-I/SL
MCP3424T-E/ST
CY7C1425KV18-250BZXI
MAX6503UKN025+T
MCP9701AT-E/LT
MGA-31289-BLKG
MIC29152WUTR
MIC29302WU-TR
MIC5209YML-TR
MM3Z27VST1G
MMA8652FCR1
UDZSTE-1712B
MMPF0100F0AEP
MMSZ4684T1G
MMSZ4688T1G
CC1206KKX7R7BB225
GCM1885C1H100GA16
ADG1207YRUZ ADG1208YCPZ ADG1208YRUZ ADG1208YRZ ADG1209YCPZ ADG1209YRUZ ADG1209YRZ
MMSZ5232BT1G
MMSZ6V8T1G
74HC4316D
MPM3805GQB-Z
MTJ88TUX1FSDPG-M205
MUN5211DW1T1G
CR-02FL6--78K7
HCGF5A-450V-3300μF-75mm×115mm
MXB7843EUE+T
NCP432BVSNT1G
NCT6106D
贴片瞬态抑制二极管_3.0SMCJ24A
WR04X105JTL
NRC06J105TRF
NRF52832-QFAA-R7
M7685-05
NTGS4141NT1G
VRB4805LD-15W
电平转换IC_TXS0108ERGYR
SN74LV14ADR
OPA330AIYFFR
KS74HCTLS322N
PC817X5NIP0F
PEX8604-BA50BCG
PEX8624-BB50RBCF
PGB1010402KR
PIC12LF1552-I/MS
PIC16C56A-04/P
GRM1885C1H390JA01D
PIC16F716-I/SS
PIC16LF1829-I/SS
RT9183-18GG
贴片电源IC_LTC3260EDE#TRPBF
LQG15HH2N0S02D
PIC18F67J10-I/PT
PIC24FJ64GA004T-I/PT
PSU PE1948/01U
PZTA42T1G
QU1500
LAD8N20
AD8548ARZ AD8551ARMZAD8551ARZ AD8552ARUZ AD8553ARMZAD8554ARUZ AD8554ARZ
REF02CSZ
RMCF0201FT4K22
TMS32C6416DGLZK6E3 TMS32C6416ECLZ5E0 TMS32C6416ECLZ6E3 TMS32C6416ECLZ7E3 TMS32C6416ECLZA5E0 TMS32C6416ECLZA6E3 TMS32C6416EGLZ5E0
RC0402DR-0710RL
GCM1885C2A471JA16
SAB-C161PI-LF CA
SC111502MZP56C
SC431AVSNT1G
SFPP-3130-L
SG1544J/883
SGTL5000XNAA3R2
SI3000-C-FS
0603B104K500T
NT71997QG-S48/A
BSP52T1G
TNY289KG-TL TNY289PG TNY289PG-TL TNY290KG TNY290KG-TL
SK50GH065F
SMBJ28CA
RC0603FR-0722RL
SN65HVD1785DR
HCGF5A-450V-3300μF-64mm×130mm
SN74AVC4T245PWR
0402N100J500CT
IN4148WT4
BZX384-B5V1
SPI08N80C3XKSA1
SSL4120T/1,518
SSM2143S-REEL
STB30NF20
YAS10-24-N
STD4N90K5
STF10LN80K5
RC0402JR-07220RL
STF23N80K5
STF3LN80K5
LNK302DN
450V/22UF(324-5414)
STF8N90K5
NCP2820MUTBG
STM32F030C6T6
STM32F101ZGT6
HES100ZE-ANT
STM8S007C8T6TR
UPD86310N7-611-H6-A
STP7LN80K5
EKY-500ELL470MF111