The description Racon beside an illustration on a chart would mean a （）.

A . The buffer is currently being accessed. B . The buffer is empty and has not been used. C . The contents of the buffer have changed and must be flushed to the disk by the DBWn process.  D . The buffer is a candidate for immediate aging out and its contents are synchronized with the block contents on the disk.

A . admires the beauty of the snowflakes． B . dislikes the changing growth history of the snowflakes． C . has a particular feeling for those flower—like crystals． D . Iikes to compare snowflakes to the stars in the sky．

A . radar transponder beacon B . radar conspicuous beacon C . radar calibration beacon D . circular radiobeaco

A . Starting with a dash and extending radially outward from the target B . As a broken line from center of PPI to the target C . Starting with a dot and extending radially inward from the target D . Starting with a dash and extending to the right of the target

A . the time it takes for a Layer 3 switch or a router to switch a packet from an inbound interface to the queue of the outbound interface B . the time it takes for a propagate from source to destination C . the time it takes to place a frame on the physical medium for transport D . the time a packet resides in the outbound queue of a router

A . Transparent mode is layer 2. B . Routed mode is layer 3. C . Routed mode has 1 IP address. D . Transparent mode has 1 IP address.

A .  Transparent mode is layer 2. B .  Routed mode is layer 3. C .  Routed mode has 1 IP address. D .  Transparent mode has 1 IP address.

A．A.PCWAS: Support the +24VDC input and is applicable to the CWU and SMU. B．B.PCWAS: Support the -48VDC input and is applicable to the CW C．C.PCWAH: Support the -48VDC input and the voltage ranges from –40V to–57V. D．D.PCWCS: Support the -60VDC input and is applicable to the CWE

A.The Mycenaeans were the first people known to have spoken Greek. B.The Mycenaeans regarded the Minoans as their potential enemies. C.The Mycenaean raid on Crete was recorded in Homer’s epics. D.The Mycenaean era is also called the “Age of Heroes”.

A．A.A prepreg is the impregnated fiber reinforcement with a resin matrix. B．B.The fiber reinforcement in a prepreg only exists in unidirectional forms C．C.The fiber reinforcement in a prepreg can exist in unidirectional or fabric forms D．D.The resins for a prepreg includes thermoset and thermoplastic resins

A．Some are not very good. B．It is unusual to see such paintings. C．Many were drawn by children. D．The artists were mostly right-hande

A. Both the power line and the grounding line use the 10mm2 multi-strand lead wire. You can also use the 16mm2 multi-strand lead wire. B.The external power lines include two blue wire, two black lines, and one yellow and green line, which represent -48V, -48V GND, and PGND. C.Wires of all kinds of colors can be used in a mixed way. D.The ZXWM M900/ZXMP M800/ZXWM-32(V1.1) equipment use the -48 V DC power supply

A．vague B．enigmatic C．ambiguous D．clear

A．The amplitude of the end plate potential is proportional to the amount of Ach released B．Some of them are depolarized, some of them are hyperpolarized C．is attributed to the Ca2+ influx at the end plate D．propagate on the end plate without the decrement of the amplitude E．followed by refractory period

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