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问题 单项选择题 B型题

强直性脊柱炎的典型的症状为（）。

A.炎症、纤维化和骨化

B.以中轴关节慢性炎症为主

C.可能与HLA-B27分子相关序列有关

D.休息时加重，活动后缓解，夜间痛明显

E.腰背疼痛、晨僵、腰椎活动受限和胸廓活动度减小

答案

参考答案：E

单项选择题

压力容器投入使用后的首次全面检验周期一般为（）年。

A.1

B.3

C.10

D.15
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单项选择题

Electronic mail and filing permit a user to compose and transmit a message on an office (71) system. In the early 1970s, the ARPANET community developed a number of such systems which have been heavily used. Through standard message format (72) , several hundred different computers and electronic mail interfaces are specification of how (73) and return addresses should appear on envelopes and which sizes are allowable for envelopes. In the electronic message world, they describe what (74) of characters are required at the (75) of a message to identify the sending and receiving mailboxes.

A．end

B．last

C．initiation

D．beginning
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