中耳乳突感染向周围扩散的途径有：________、________和________

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问题填空题

中耳乳突感染向周围扩散的途径有：________、________和________。

答案

参考答案：破坏、缺损的骨壁解剖通道或未闭合的骨缝血行途径

单项选择题

进行算术或逻辑运算的设备

A．Telnet和FTP
B．Modem和ISDN
C．IE和Netscape
D．Outlook Express和Foxmail
E．Internet和Intranet

单项选择题

The _______ contract is a contract between a party who agrees to accept the risk and a party seeking protection from the risk

A．payment

B．production

C．shipment

D．insurance