物理学中规定，用丝绸摩擦过的玻璃棒带的电荷叫 电荷，用毛皮摩擦过的橡胶棒带的电荷

用括号内所给词的适当形式填空。

1. — Could you tell me how __________ (get) to the market? 

      — Go down this road to the end, and you'll find it.

2. It's 8:00. The students _______ (have) lessons.

3. The baby is crying. He _______ (fall) down from the bed just now.

4. It is an interesting story, so each of children enjoys ______ (read ) it.

5. Tomorrow is her daughter's _______ (nine) birthday. She'll buy some presents.

一个环形，外圆直径是6厘米，内圆直径是4厘米，环宽是______厘米，环形面积是______平方厘米．

Java是一种______程序设计语言。

A．面向过程

B．面向对象

C．函数式

D．逻辑型

各公司对载有技术秘密的（）等资料及样品，应注明保密字样，并采取保密措施，归档保存，严格查阅、借阅制度。

A、文件材料

B、图纸

C、磁（光）盘

D、图像、电子文档

河北满城汉墓出土了一件名为（）的灯具，利用虹吸的原理，即使以今天的设计观点看，也是一件超凡脱俗的佳作。