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问题 单项选择题

用示波器检查某发动机点火波形，发现其击穿火花塞间隙的发火线电压均偏低，最大的可能原因是（）。

A.分火头与分火盖触点间的间隙过大

B.高压点火线电阻过大

C.火花塞间隙均偏大

D.火花塞积炭较多

答案

参考答案：D

单项选择题 A1/A2型题

30岁男性，双上肢针刺不知疼痛，热水烫无知觉。查体双上肢痛温觉丧失，触觉存在，病变最可能的部位是（）。

A.脊髓前角

B.脊髓前角，锥体束

C.脊髓后索

D.脊髓灰质前联合

E.脊髓半侧损害
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单项选择题

Certificates are (66) documents attesting to the (67) of a public key to an individual or other entity. They allow verification of the claim that a given public key does in fact belong to a given individual. Certificates help prevent someone from using a phony key to (68) someone else. In their simplest form, Certificates contain a public key and a name. As commonly used, a certificate also contains an (69) date, the name, of the CA that issued the certificate, a serial number, and perhaps other information. Most importantly, it contains the digital (70) of the certificate issuer. The most widely accepted format for certificates is X.509, thus, Certificates can be read or written by any application complying with X.509.

A．impersonate

B．personate

C．damage

D．control
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