离心泵导轮上叶片的弯曲方向与叶轮上叶片的弯曲方向（）。 A.一致 B.相反 C.有的

关于胎盘合成的耐热性碱性磷酸酶的叙述，错误的是（）

A.由胎盘合体滋养细胞分泌

B.妊娠12～15周开始可从母血中检出

C.在妊娠中后期分泌逐渐增多

D.产后3～6日消失

E.可用于评估胎盘功能

如图所示为某一装置的俯视图，M、N为两个竖直放置的平行金属板，相距为0.4 m，L₁和L₂为与M、N平行的两根金属导轨（两导轨较细，与M、N上边棱处于同一水平面）,L₁与M以及L₂与N的间距都是0. 1 m，两导轨的电阻不计，其右端接有R="0." 3Ω的电阻．现有一长为0. 4 m、电阻为0.2Ω的均匀金属导体棒ab，棒上的a、b、c、d四点分别与M、 N、L₁、L₂接触良好，且金属棒ab与金属板M、N正交，整个装置放在竖直向下的匀强磁场中．今有一带正电粒子（不计重力）以v₀="7" m/s的初速度平行于极板水平入射．求当金属棒ab向何方向以多大速度运动时，可使带电粒子做匀速直线运动？

阅读理解。

     These days a green building means more than just the color of the paint. Green building can also refer

to environmentally friendly houses, factories, and offices.

     Green building means"reducing the impact (影响) of the building on the land", Taryn Holowka of the

U.S. Green Building Council in Washington, D.C., said.

     According to Holowka, building account for (占了) 65 percent of total U.S. electricity use.

     But green building can reduce energy and water use. Also, the building are often located near public

transportation such as buses and subways, so that people can drive their cars less. That could be good for

the environment, because cars use lots of gas and give off pollution. Green building are often built on

developed land, so that the buildings don't destroy forests.

      Marty Dettling is project manger for a building that put these ideas into action. The Solaire has been

called the country's first green high-rise building. According to Dettling, "We've reduced our energy use by

one-third and our water by 50 percent,"

     The Solaire cuts energy in past by using solar power. "On the face of the building we have solar panels

which change the sun's energy into electricity," Dettling explained.

     The solaire also has lights that automatically turn off when people leave the room. In addition, the building

has lots of windows, allowing people to use the sun for light during the day. The solaire cuts water reusing it.

     Not everyone is eager to move into a green building, however. Some people think that things like solar

panels cost more money than more traditional energy sources. Anyhow, Holowka said, "It's going to be big."

1. In the second paragraph, the underlined words"the building" most probably refer to ____.

A. an ordinary building

B. an energy-saving building

C. a green-colored building

D. a building in Washington D.C.

2. A green building is often built on an area of land ______.

A. which has thick forests around

B. which has already been for buildings

C. where people of high income live

D. where traveling around by car is most convenient

3. When Holowka says in the last paragraph, "It's going to be big", she means that green buildings _____.

A. will be more comfortable

B. will become popular in future

C. will be more environmentally friend

D. will take the place of traditional building

4. When is the main subject discussed in the text?

A. Dettling designed the first green building in the U.S.

B. Energy shortage calls for buildings of new design.

C. Green building help save environment.

D. The Solaire serves as a model of high building.

将图元或图素间的分支连线规整为4个或8个标准方向的快捷键是（）

A.Ctrl+1

B.Ctrl+2

C.Ctrl+Enter

前向RA信道和38.4kbps、76.8kbps控制信道分别占用的MACIndex是（）

A.1，3，2

B.2，3，4

C.4，3，2

D.4，2，3