通常按制盒方式把纸盒分为（）。A、折叠纸盒 B、管式纸盒 C、固定纸盒 D、盘式纸盒

男性，53岁。头晕、乏力、四肢麻木、站立和行走不稳半年余就诊。8年前曾因胃出血行全胃切除术。化验：RBC2.1×10¹²／L，Hb72g/L，WBC3.2×10⁹/L，PLT86×10⁹/L，MCV140fl（140μm³），MCH42pg，血清维生素B12浓度86pg/ml（正常值200～900pg/ml），叶酸正常。

本例拟诊为维生素B12缺乏性贫血，其最可能的原因是（）

A.维生素B12摄入不足

B.慢性腹泻致维生素B12吸收减少

C.内因子缺乏症

D.合并节段性回肠炎（克隆病）

E.肠道寄生虫感染

以下软件中（）属于应用软件。

A.文字处理软件

B.表格处理软件

C.游戏软件

D.会计核算软件

现浇钢筋混凝土预应力箱梁模板支架刚度验算时，在冬期施工的荷载组合包括（）。

A.模板、支架自重

B.现浇箱梁自重

C.施工人员、堆放施工材料荷载

D.风雪荷载

E.倾倒混凝土时产生的水平冲击荷载

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) .

20（）

A.warmth

B.severity

C.tension

D.fever

用氢-钠离子交换法处理后，应使水中保留一定的（）。

A、硬度

B、碱度

C、酸度

D、钠离子