大气压强的值约为105Pa，则大气压对你的一只大拇指指甲表面的压力大约是（ ）

某孕妇为Rh^-，第一胎分娩Rh⁺胎儿，为防止再次妊娠的Rh胎儿产生溶血症，应给Rh母亲注射（）

A.抗Rh因子抗体

B.Rh抗原

C.免疫抑制剂

D.免疫增强剂

E.以上都不是

设α₁，α₂，…，α_s，β是线性相关的n维向量组，则（）。

A．β可由α₁，α₂，…，α_s线性表示

B．β不可由α₁，α₂，…，α_s线性表示

C．若秩r(α₁，α₂，…，α_s，β)=s，则β可由α₁，α₂，…，α_s线性表示

D．若α₁，α₂，…，α_s线性无关，则β可由α₁，α₂…，α_s线性表示

下列选项中没有语病的一项是[ ]

A．一代代艺术家通过对中 * * 优秀艺术传统的继承、提高、升华，才有了艺术新形式、审美新形态的诞生和发展。

B．国家知识产权局有关负责人认为，国内专利申请的持续快速增长，表明我国公众的专利意识和研究开发水平不断提高。

C．南昌至上海、杭州的火车动车组票价分别为228元、179元，而对应的普通列车硬座票价为106元、8l元，相比之下，普通列车硬座票价要低一倍多。

D．承担全面建设小康社会的历史任务，开创中 * * 伟大复兴的光明前景，难道谁能否认这是当代中国青年肩负的崇高使命吗？

阅读理解。

     Do you know that you can use your watch as a compass (指南针) on a sunny day? Take a watch and

point the hour-hand in the direction (方向) of the sun. Imagine a line which runs from the center of the watch

through a point half-way between the hour-hand and number one. This line will surely point south.

     If you know astronomy a little, you will understand why this works. In the northern half of the earth, the

sun is in the south at noon. In Russia, the real noon is one o'clock. If at that time we point the hour-hand at

the sun, the hour-hand and number one will point south. That is why you must imagine a line which will run

from the center of the watch through a point half-way between the hour-hand and number one. It will point

south. If you are in the southern part of our planet, you must point number 12 at the sun. The line which you

can imagine between number twelve and the hour-hand will then show south.

1. When we carry out this experiment in the northern part of the earth, we should point _____ at the sun. [ ]

A. number 12

B. the minute-hand

C. the hour-hand

D. number one

2. The passage tells us that we can use a watch on a sunny day _____. [ ]

A. to study the weather

B. to show direction

C. to enjoy ourselves

D. to keep good time

3. If you are in Australia, which of the following is the right way to show north? [ ]

A.

B.

C.

D.

4. What's the best title for this passage? [ ]

A. Your Watch Becomes a Compass

B. An Interesting Watch

C. The Story of a Watch

D. The Sun and a Watch

液相色谱法检测甲萘醌含量，检测器检测波长为（）nm。

A、190

B、220

C、250

D、326