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问题 单项选择题 A1/A2型题

最常见的房间隔缺损类型是（）

A.原发孔型房间隔缺损

B.继发孔型房间隔缺损

C.获得性房间隔缺损

D.卵圆孔未闭

E.静脉窦型房间隔缺损

答案

参考答案：B

解析：房间隔缺损以第二孔（继发孔）未闭型为最多见。

单项选择题

In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. There are two types of key technology: private key and public key. Private - key encryption methods are called (66) ciphers, information is encrypted with (67) both the sender and receiver hold privately. Public - key encryption methods are called (68) ciphers, (69) created for each user, encryption key and decryption key ale (70) .

A．two related keys ale

B．a key is

C．two unrelated keys ale

D．three keys ale
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问答题 简答题

如何用汽泵前置泵代替电泵向锅炉上水？
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