题目内容

甲通过TCP连接给乙发送数据，乙收到序号为500、数据长度为300字节的报文之后，乙将会回复确认号为()的报文给甲。

A. 501
B. 799
C. 800
D. 801

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The center function of M-type three-position four-way directional valve is ().

A. pressure port unloading, two working oil ports locking,
B. pressure oil port unloading, two working oil ports unloading
C. all ports are locked
D. all ports are unloaded

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In the hydraulic system, which valve can be used as back pressure valve. ()

A. pressure relief valve
B. pressure reducing valve
C. hydraulic control sequence valve
D. speed regulating valve

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Low pressure system generally selected __________ structure pressure relief valve as safety valve. ()

A. differential type
B. pilot type
C. direct acting type
D. cone valve type

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The orifice of throttle valve should select ().

A. thin wall hole
B. short hole
C. slender hole
D. A + C

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甲通过TCP连接给乙发送数据，乙收到序号为500、数据长度为300字节的报文之后，乙将会回复确认号为()的报文给甲。

A. 501 B. 799 C. 800 D. 801

The center function of M-type three-position four-way directional valve is ().

In the hydraulic system, which valve can be used as back pressure valve. ()

Low pressure system generally selected __________ structure pressure relief valve as safety valve. ()

The orifice of throttle valve should select ().

A. 501
B. 799
C. 800
D. 801