事故蒸发器的作用是（）。A．保证紧急停车时乙烯产品的正常外送 B．外送量较小时，可保

下列光学器材中，可以用来成等大虚像的是 [ ]

A．放大镜

B．平面镜

C．照相机

D．幻灯机

宋代民谚称“苏湖熟天下足”，明代中后期则称“湖广熟天下足”，民谚的变化实际上折射了

A．经济重心的不断南移

B．江浙地区的经济衰退

C．江浙经济结构的变动

D．湖广经济超越了江浙

某设备安装工程，业主分别与土建和安装单位签订了基础、设备土建和安装工程施工合同。两个承包商都编制了相互协调的进度计划。进度计划已得到批准。基础施工完毕，设备安装单位按计划将材料及设备运进现场，准备施工。经检测发现有10%的设备预埋螺栓位置偏移过大，无法安装设备，需返工处理。安装工作因基础返工而受到影响，安装单位提出索赔要求。
问题

采用软加密技术，会存在哪些隐患。（）

A.密钥分配协议均有缺陷

B.密钥的管理很复杂

C.容易给攻击者采用分析程序进行跟踪、反编译等手段进行攻击

D.软加密的兼容性太差

Analysts have their go at humor, and I have read some of this interpretative literature, (1) without being greatly instructed. Humor can be (2) , (3) a frog can, but the thing dies in the process and the innards are (4) to any but the pure scientific mind.

One of the things (5) said about humorists is that they are really very sad ’people clowns with a breaking heart. There is some truth in it, but it is badly (6) . It would be more (7) , I think, to say that there is a deep vein of melancholy running through everyone’s life and that the humorist, perhaps more (8) of it than some others, compensates for it actively and (9) Humorists fatten on troubles. They have always made trouble (10) They struggle along with a good will and endure pain (11) , knowing how well it will (12) them in the sweet by and by. You find them wrestling with foreign languages, fighting folding ironing hoards and’ swollen drainpipes, suffering the terrible (13) of tight boots. They pour out their sorrows profitably, in a (14) of what is not quite fiction nor quite fact either. Beneath the sparking surface of these dilemmas flows the p (15) of human woe.

Practically everyone is a manic depressive of sorts, with his up moments and his down moments, and you certainly don’t have to be a humorist to (16) the sadness of situation and mood. But there is often a rather fine line between laughing and crying, and if a humorous piece of writing brings a person to the point (17) his emotional responses are untrustworthy and seem likely to break over into the opposite realm, it is (18) humor, like poetry, has an extra content, it plays (19) to the big hot fire which is Truth, and sometimes the reader feels the (20) .

13（）

A.pleasure

B.exhibition

C.prejudice

D.discomfort