作业的控制方式有脱机控制方式，联机控制方式和终端控制方式。( )

下列哪项符合尼曼一匹克细胞的细胞化学染色()

A．POX染色呈阳性

B．SBB染色呈阴性

C．PAS染色泡壁呈弱阳性

D．ACP染色呈阳性

E．NAP染色呈阴性

 To us it seems so natural to put up an umbrella to keep the water off when it rains. But actually the umbrella was not invented as protection against the rain. Its first use was as a shade against the sun!

Nobody knows who first invented it, but the umbrella was used in very ancient times. Probably the first to use it were the Chinese, back in the eleventh century B.C.

We know that the umbrella was used in ancient Egypt and Babylon as a sunshade. And there was a strange thing connected with its use: it became a symbol of honor. In the Far East in ancient times, the umbrella was allowed to be used only by those in high office.

In Europe, the Greeks were the first to use the umbrella as a sunshade. And the umbrella was in common used in ancient Greece. But it is believed that the first persons in Europe to use the umbrella as protection against the rain were the ancient Romans.

During the Middle Ages, the use of the umbrella practically disappeared. Then it appeared again in Italy in the late sixteenth century. And again it was considered as a symbol of power. By 1680, the umbrella appeared in France, and later on in England.

By the eighteenth century, the umbrella was used against rain throughout most of Europe. Umbrellas have not changed much in style during all this time, though they have become much lighter in weight. It wasn’t until the twentieth century that women’s umbrellas began to be made, in a whole variety of colours.

45. According to this passage, the umbrella was probably first invented in ancient _______.

A. China         B. Egypt       C. Greece         D. Rome

46. Which of the following statements is not true about the umbrella?

A. No one exactly knows who was the inventor of the umbrella.

B. The umbrella was first invented to be used as protection against the sun.

C. The umbrella changed much in style in the eighteenth century.

D. In Europe, the Greeks were the first to use the umbrella as a sunshade.

47. A strange feature(特征) of the umbrella’s use is that it was used as _______.

A. protection against rain                    B. a shade against the sun

C. a symbol of honour and power              D. women’s decoration

48. In Europe, the umbrella was first used against the rain ___________.

A. during the Middle Ages   B. by the eighteenth century   C. in Rome   D. in Greece

女，70岁，进食后上腹胀满伴剑突下疼痛及气短10个月，乏力消瘦1个月。胸片提示左心影后气液平面。

治疗首先考虑（）

A.手术

B.抑酸药

C.促胃动力药

D.抗寄生虫药

E.抗胆碱药

某城市桥梁工程由某路桥工程公司承担施工任务。该路桥工程公司在预应力筋进场时进行了分批验收，每批验收的重量都不超过60t，验收合格方能使用。为了节约施工时间，公司负责人决定直接将预应力筋和金属管道堆放在施工地点，这样就免除了拖运时间，但是在施工时期，员工发现大量的预应力筋和金属管道已生锈，损坏，不能进行正常的工作，为此，公司只能再次购买这些材料，将其存放在干燥的仓库。

在同种材料和同一生产工艺条件下，连接口应以不超过( )为一个验收批。

A．500套组

B．600套组

C．800套组

D．1 000套组

对于常规现金流量的建设项目，若基准折现率增大，则( )。

A．NPV与IRR均减小

B．NPV与IRR均增大

C．NPV减小，IRR增大

D．NPV减小，IRR不变