【单选题】以下脑卒中危险因素中属于不可改变的因素的是:
【单选题】What is the main idea of the passage?
A.
A weatherman is giving a forecast of tomorrow's weather conditions in the country.
B.
A weather analyst is reviewing the weather conditons of the past two days.
C.
An announcer is discussing possible changes in the weather over the next few days.
D.
The local weather channel is announcing a sudden change of weather tomorrow.
【单选题】What is the main idea of the passage?
A.
The local weather channel is announcing a sudden change of weather tomorrow.
B.
A weatherman is giving a forecast of tomorrow’s weather conditions in the country.
C.
A weather analyst is reviewing the weather conditions of the past two days.
D.
An announcement is discussing possible changes in the weather over the next few days.
【单选题】1840年,( )发动了侵略中国的鸦片战争。
【单选题】下列关于消息认证码的说法中错误的是()。
D.
MAC 利用密钥来生成一个固定长度的短数据块
【简答题】某一载货轮船,在航行途中遇特大风浪,不幸触礁,船身被撞穿一个大洞,随即海水大量涌入,不仅使货物遭到严重的水渍,而且船舶由于大量进水,随时有沉船的危险。为下船、货的共同安全,船长急令轮船驶向附近的浅滩,同时命令将部分货物抛到海里。船舶在浅滩搁浅后,滞留多日,被一过路货轮发现,拖到附近港口检修。经过检查与核对,在这次事故中,该船遭受了如下损失: (1)因触礁,船舶被撞穿一个大洞; (2)因船舶进水,有...
【简答题】某一载货轮船,在航行途中遇特大风浪,不幸触礁船身被撞穿一个大洞,随即海水大量涌入,不仅使货物遭到严重的水渍,而且船舶由于大量进水,随时有沉船的危险。为了船、货的共同安全,船长急令轮船驶向附近的浅滩,同时命令将部分货物抛到海里。船舶在浅滩搁浅后,滞留多日,被一过路货轮发现,拖到附近港口检修。经过检查与核对,在这次事故中,该船遭受了如下损失:(1)因触礁,船舶被撞穿一个大洞;(2)因船舶进水,有50包...
【单选题】1840年,( )发动了侵略中国的鸦片战争。