如图所示，电源两端电压U保持不变。当开关S1闭合、S2断开，滑动变阻器接入电路中

任意投掷一枚均匀的硬币三次，至少有两次出现反面朝上的概率为______．

单层刚弹性方案的房屋，在进行静力计算时按（）分析。

A、平面排架

B、具有不动铰支座的平面排架

C、考虑空间工作的平面排架

具有孕激素样作用的药物是（）.

A.A

B.B

C.C

D.D

E.E

The most accurate and most boring way to (66) Java is that it is a new computer programming language developed by Sun Microsystems that creates (67) independent programs that can be distributed and run remotely. To run Java programs, a computer must have a Java interpreter. Currently (68) Java programs are small "applets" that are (68) as part of web pages.

When you use a Java (69) browser to view a Web page that includes a Java applet, the browser loads the applet onto your computer through your modem or network. Then the Java interpreter runs the applet, which could include animation or sound, on your computer rather than transmitting the code bit by bit over Internet. A few thousand bytes of Java code can turn into a powerful program on your computer.

So an applet could include (70) with Java interpreter.

（69）处填（）。

A．stable

B．probable

C．available

D．capable

透平鼓风机的转子主要由主轴、叶轮、平衡盘、（）和联轴器组成。