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【单选题】
下列各组词语中,画线字的读音全都正确的一组是( )A.
毗邻(pí) 召开(zhāo) 一丘之貉(hé)
B.
手帕(pà) 悭吝(jiān) 踽踽独行(jǔ)
C.
亚洲(yǎ) 恪守(kè) 茕茕孑立(qiónɡ)
D.
圭臬(niè) 即使(jí) 断壁残垣(yuán)
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皮皮学刷刷变学霸
举一反三
【单选题】Motor vessels usually have independent lube oil systems for main engine and reduction gears because ____.
A.
contaminants produced by the engine could harm the reduction gears
B.
non-additive oils are used in the main engine system
C.
different type centrifuges are required for the main engine and reduction gear tube systems
D.
coolers are not needed for the gear system
【简答题】超文本传输协议HTTP的端口号是______,文件传输协议FTP的端口号是__________,远程登录协议TELNET的端口号是______,域名解析服务器DNS的端口号是__________,简单邮件传输协议SMTP的端口号是________,邮局协议版本POP3的端口号是__________,交互式邮件存取协议IMAP的端口号是__________,简单文件传输协议TFTP的端口号是____...
【单选题】Motor vessels usually have independent lube oil systems for main engine and reduction gears because ________.
A.
coolers are not needed for the gear system
B.
contaminants produced by the engine could harm the reduction gears
C.
non-additive oils are used in the main engine system
D.
different type centrifuges are required for the main engine and reduction gear lube systems
【单选题】Motor vessels usually have independent lube oil systems for main engine and reduction gears because____
A.
coolers are not needed for the gear system
B.
contaminants produced by the engine could harm the reduction gears
C.
non-additive oils axe used in the main engine system
D.
different type centrifuges are required for the main engine and reduction gear lube systems
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